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So from the Mojave App Store, I can't find way to download the older OS. (El Cap, Sierra, High Sierra). Got through to high-level Apple support via phone, and they sent me an email with three Apple articles that had links in them (scroll down to download and click) that would indeed show the correct OS in the Mojave App Store with a "Get" button. However, clicking on the "Get" button would led to an error that the OS could not be downloaded. So Kafka... (read below if you like good reads.)
Before the Law stands a doorkeeper on guard. To this doorkeeper there comes a man from the country who begs for admittance to the Law. But the doorkeeper says that he cannot admit the man at the moment. The man, on reflection, asks if he will be allowed, then, to enter later. 'It is possible,' answers the doorkeeper, 'but not at this moment.' Since the door leading into the Law stands open as usual and the doorkeeper steps to one side, the man bends down to peer through the entrance. When the doorkeeper sees that, he laughs and says: 'If you are so strongly tempted, try to get in without my permission. But note that I am powerful. And I am only the lowest doorkeeper. From hall to hall keepers stand at every door, one more powerful than the other. Even the third of these has an aspect that even I cannot bear to look at.' These are difficulties which the man from the country has not expected to meet, the Law, he thinks, should be accessible to every man and at all times, but when he looks more closely at the doorkeeper in his furred robe, with his huge pointed nose and long, thin, Tartar beard, he decides that he had better wait until he gets permission to enter. The doorkeeper gives him a stool and lets him sit down at the side of the door. There he sits waiting for days and years. He makes many attempts to be allowed in and wearies the doorkeeper with his importunity. The doorkeeper often engages him in brief conversation, asking him about his home and about other matters, but the questions are put quite impersonally, as great men put questions, and always conclude with the statement that the man cannot be allowed to enter yet. The man, who has equipped himself with many things for his journey, parts with all he has, however valuable, in the hope of bribing the doorkeeper. The doorkeeper accepts it all, saying, however, as he takes each gift: 'I take this only to keep you from feeling that you have left something undone.' During all these long years the man watches the doorkeeper almost incessantly. He forgets about the other doorkeepers, and this one seems to him the only barrier between himself and the Law. In the first years he curses his evil fate aloud; later, as he grows old, he only mutters to himself. He grows childish, and since in his prolonged watch he has learned to know even the fleas in the doorkeeper's fur collar, he begs the very fleas to help him and to persuade the doorkeeper to change his mind. Finally his eyes grow dim and he does not know whether the world is really darkening around him or whether his eyes are only deceiving him. But in the darkness he can now perceive a radiance that streams immortally from the door of the Law. Now his life is drawing to a close. Before he dies, all that he has experienced during the whole time of his sojourn condenses in his mind into one question, which he has never yet put to the doorkeeper. He beckons the doorkeeper, since he can no longer raise his stiffening body. The doorkeeper has to bend far down to hear him, for the difference in size between them has increased very much to the man's disadvantage. 'What do you want to know now?' asks the doorkeeper, 'you are insatiable.' 'Everyone strives to attain the Law,' answers the man, 'how does it come about, then, that in all these years no one has come seeking admittance but me?' The doorkeeper perceives that the man is at the end of his strength and that his hearing is failing, so he bellows in his ear: 'No one but you could gain admittance through this door, since this door was intended only for you. I am now going to shut it.

― Franz Kafka, The Trial
 


I just upgraded from High Sierra to Mojave yesterday on my work machine, and promptly encountered the Could not Check for Updates problem (the machine was on macOS 10.14, and I know there is a 10.14.2 waiting) and Could not Connect to App Store problem. It was strange, as all my other applications, browsers, etc. were able to access and download stuff from the Internet properly.
I had a similar issue and, remembering your post, used the control panel to disconnect ethernet; waited ten seconds; reconnected ethernet. Suddenly, it worked.

My issue was different—I was restoring an old original iPad, and it wouldn't recover it, because it couldn't connect to the iTunes server to check for software updates (as though!).

FWIW, Apple's own instructions on this are incorrect. They claim a reboot while connected to the Mac will bring up the recovery menu. This doesn't work. Somewhere else, I found instructions to plug one end of the cable into the Mac, shut off the iPad normally, then, while holding down the Home button, connect the iPad to the Mac. That worked!
 


So from the Mojave App Store, I can't find way to download the older OS. (El Cap, Sierra, High Sierra). Got through to high-level Apple support via phone, and they sent me an email with three Apple articles that had links in them (scroll down to download and click) that would indeed show the correct OS in the Mojave App Store with a "Get" button. However, clicking on the "Get" button would led to an error that the OS could not be downloaded. So Kafka... (read below if you like good reads.)
I had the same issue. Trying to reinstall macOS in an old Mac whose hard drive died and replaced with SSD. Could not find the original CDs, nor a bootable copy of macOS to download. If I tried downloading with Mojave, I would get the error that the OS was not supported. If I downloaded with High Sierra, the download would start but then unexpectedly lose network connection halfway through the download. This happened on several computers.

As a matter of fact, I could not even download the latest iOS on several computers with network connection reset error halfway through the download.
 


Do you perhaps have differing DNS's assigned to the two options (Ethernet and WIFI)? It is possible that the wired DNS is unable to resolve the address. I have had this situation arise when I have had a DNS set in my network preferences. Some things can be accessed but others can not. By changing to a "non-denominational" DNS (let the system decide), I have then been able to connect to the previously unreachable web sites. It might be worth checking.
I have been getting several connection reset errors while downloading iOS and macOS updates. I have set my DNS to OpenDNS with my Airport Time Capsule in DMZ and my U-Verse router is supplying IPv6. I have set my DNS to use IPv4 with OpenDNS to allow for filtering. Yes I get connection reset halfway during download or error 9006. However the iOS devices on the same network are able to download the updates, but not the Macs. Anyone have an idea what could be wrong? This worked fine a couple of months ago and started having issues on November.
 


Ric Ford

MacInTouch
I had the same issue. Trying to reinstall macOS in an old Mac whose hard drive died and replaced with SSD. Could not find the original CDs, nor a bootable copy of macOS to download. If I tried downloading with Mojave, I would get the error that the OS was not supported.
It might be worth trying to reinstall via Recovery mode:
Apple Support said:
Reinstall from macOS Recovery
...
Shift-Option-⌘-R
Install the macOS that came with your Mac, or the closest version still available.

... If macOS Sierra 10.12.4 or later was never installed on your Mac, macOS Recovery works differently...
  • Option-Command-R installs the macOS that came with your Mac, or the closest version still available.
  • Shift-Option-Command-R isn't available.
 


Do you perhaps have differing DNS's assigned to the two options (Ethernet and WIFI)? It is possible that the wired DNS is unable to resolve the address. I have had this situation arise when I have had a DNS set in my network preferences. Some things can be accessed but others can not. By changing to a "non-denominational" DNS (let the system decide), I have then been able to connect to the previously unreachable web sites. It might be worth checking.
I can't remember now exactly what my previous configuration was. The iMac is configured using DHCP, and I had to configure IPv6 to Link Local Only, due to a broken IPv6 prefix configuration in my network. Nonetheless, there isn't any IPv6 DNS configuration in the DHCP parameters, so it shouldn't affect network connectivity.

I don't think I set an alternate DNS (though I have configured my home machines for Google DNS running on a different AppleID; I don't know if network settings are shared from one device to another, but it should not affect the iMac, which is using a different AppleID).

The weird thing is that it persists after a reboot, so the "App Store is Unreachable" status seems to be cached somewhere and was not fixed by rebooting.
 


It might be worth trying to reinstall via Recovery mode...
This is a bit off topic, but I was upgrading a bunch of Late-2012 iMacs to Mojave, with reFind to enable multi-OS selection on booting. To install reFind, I need to boot into recovery mode (hence disabling System Integrity Protection) to run the installer.

The problem is that the recovery mode partition is removed by the Mojave installer (it would be useless in any case, since it doesn't understand APFS), but the Internet Recovery Image is also unable to recognize APFS partitions!

I ended up needing to boot from a bootable USB Mojave installer to access Recovery Tools that can mount APFS.
 


Ric Ford

MacInTouch
... The problem is that the recovery mode partition is removed by the Mojave installer (it would be useless in any case, since it doesn't understand APFS), but the Internet Recovery Image is also unable to recognize APFS partitions! ...
I wonder if you could do this?
  1. Add a (small) unencrypted HFS partition to the drive.
  2. Select that small partition in Carbon Copy Cloner.
  3. Click the Recovery HD... button.
  4. Clone Recovery HD
This might only work on a pre-Mojave system, though. I haven't tried it on Mojave, but I do it frequently in macOS Sierra, and it adds a Recovery HD partition, which you can see if you type the diskutil list command in Terminal.
 



I installed Security Update 2018-003 10.13.6 (1.8GB download) a few weeks ago. Today it showed up again in App Store Updates. Maybe it's different without a version number change? I installed it again. After the requisite reboot, it shows up in App Store Updates again.
 


I installed Security Update 2018-003 10.13.6 (1.8GB download) a few weeks ago. Today it showed up again in App Store Updates. Maybe it's different without a version number change? I installed it again. After the requisite reboot, it shows up in App Store Updates again.
I did several updates yesterday for apps and Security -- and they show up again today.
 


I had a problem with two third-party applications: clicking the Update button for either resulted in an endlessly spinning gear at the upper left of the App Store window. But, in consult with Apple Support, this worked for them: close App Store; open System Preferences > Spotlight. In the Search Results tab, assure that Applications is checked. In the Privacy tab, make sure that {...mumble...} is not listed.

For both, I made no changes; just opening and closing the Spotlight prefs evidently causes it to reindex. Give it "a while" for the reindex, then try App Store again. This allowed the two applications to update normally.
 


Ric Ford

MacInTouch
I have a second production system for a specific task, a 2011 MacBook Pro running macOS Sierra. I was using it for another job yesterday, and it wanted to do a security update and a Safari update. OK, probably a good idea.

Now, when I try to login to the main production account (non-admin account), all I get is a blank screen. (The admin account still works.) I tried a bunch of tricks and workarounds (e.g. Safe Boot, user account settings changes, etc.), but none worked.

I'm now restoring from an old backup. Great.
 


When the downloaded combo updater said I couldn't install the macOS 10.14.3 update on my 27" iMac 2015, I should have walked away and waited, but, no, I just had to do it through System Update in the System Preferences pane. Well...

I just updated to macOS 10.14.3, and my Bluetooth vanished - not working (no mouse, no keyboard). I hooked up a USB mouse and keyboard, and found that the Bluetooth icon was gone from System Preferences, could not be found with Spotlight, and nothing was listed in the About This Mac > System Report > Bluetooth! Gone!!

This maneuver saved me:
Apple Discussions said:
Just in case anyone needs this!
 


I have a MacBook Pro (Retina, 13-inch, Late 2013, 2.8 GHz Core I7, 16 GB running 10.14.2.)

I've downloaded the 10.14.3 combo updater twice and it tells me that I cannot install the update as my computer does not meet the minimum requirements for installation. (or words to that affect).

Pretty weird! First time that this has ever happened!
 


Can anyone explain why I currently have Version 3 of the App Store application (which is the version associated with Mojave) installed, even though I am currently running High Sierra, which requires version 2.4 of the App Store application?

Accordingly I am unable to download and install the latest updates for High Sierra released today. Yes, I have found the direct download for the "Security Update 2019-001" but am not sure how I would get the Safari update.

Thanks
 



I have a MacBook Pro (Retina, 13-inch, Late 2013, 2.8 GHz Core I7, 16 GB running 10.14.2.)
I've downloaded the 10.14.3 combo updater twice and it tells me that I cannot install the update as my computer does not meet the minimum requirements for installation. (or words to that affect).
Pretty weird! First time that this has ever happened!
That happened to me too. I waited a few hours, then downloaded the "macOSUpdCombo10.14.3.dmg" file again. This time it presented the disks available for updating correctly.

I have no way to prove this, but I'm guessing Apple messed up the earlier Combo updater, received reports of their error, then silently replaced the original file with a corrected version. (It's not like that part of the scenario has never happened.)
 


That happened to me too. I waited a few hours, then downloaded the "macOSUpdCombo10.14.3.dmg" file again. This time it presented the disks available for updating correctly.
Unfortunately after downloading a new copy of the Combo updater I still get the same message. Now it is a bit annoying. I've never had this problem with Apple before. Oh well!
 



And now, 24 hours later, Apple still has not replaced/fixed this problem.

I am a long-time, since the Apple II days, user of Apple products, and this inability to release a usable system update is very sad. Welcome to modern American business practices!
 


And now, 24 hours later, Apple still has not replaced/fixed this problem.
I went to the local Apple Store here in Tucson to ask about this situation. They were unaware of any difficulties. They recommended that I call Apple Customer Support, which I did.

The Apple tech was unaware of the problem that I was describing with the combo updater. So asked if she could do a screen share with me. As she watched, she had me go to the App Store, select Updates and then search for Mojave. She had me download the Mojave installer, which asked if I wanted to install 10.14.3. I said yes, of course!

After 40+ minutes, my retina MacBook Pro restarted and macOS 10.14.3 was installed.

I did the same with my wife’s 13" retina MacBook Pro. The combo updater also did not work on her computer. Doing the above worked for her, too.

macOS 10.14.3 is working as expected on both machines.

A long and winding road to finally achieve success!
 


Like many of you, I had the same problem with the macOS 10.14.3 combo updater on two machines (2015 MacBook Air 11", 2015 Retina MacBook Pro 15"). Two downloads on two different days. Get Info reported the exact same number of bytes in the files, and neither one would install.

So I downloaded the delta update from Apple Downloads, and it installed just fine on both. (Haven't tried either yet on the cheese grater.)
 


Ric Ford

MacInTouch
When the downloaded combo updater said I couldn't install the macOS 10.14.3 update on my 27" iMac 2015, I should have walked away and waited, but, no, I just had to do it through System Update in the System Preferences pane. Well...
I just updated to macOS 10.14.3, and my Bluetooth vanished - not working (no mouse, no keyboard). I hooked up a USB mouse and keyboard, and found that the Bluetooth icon was gone from System Preferences, could not be found with Spotlight, and nothing was listed in the About This Mac > System Report > Bluetooth! Gone!!
This maneuver saved me:
Just in case anyone needs this!
That is resetting the SMC (System Management Controller). The procedure is different for different Mac models:
How to reset the System Management Controller (SMC) on your Mac
Thanks for the heads-up on that. It turns out that Mac laptops with T2 chips have a bizarre new, two-step SMC Reset contortion:
Apple Support said:
How to reset the System Management Controller (SMC) on your Mac

Mac notebook computers with the T2 chip
...
If that doesn't resolve the issue, follow these steps:
  1. Choose Apple menu > Shut Down.
  2. After your Mac shuts down, press and hold the right Shift key, the left Option key, and the left Control key for 7 seconds. Then keep holding those keys while you press and hold the power button for another 7 seconds.
  3. Release all three keys and the power button, then wait a few seconds.
  4. Press the power button again to turn on your Mac.
 



Like many of you, I had the same problem with the macOS 10.14.3 combo updater on two machines (2015 MacBook Air 11", 2015 Retina MacBook Pro 15"). Two downloads on two different days. Get Info reported the exact same number of bytes in the files, and neither one would install.

So I downloaded the delta update from Apple Downloads, and it installed just fine on both. (Haven't tried either yet on the cheese grater.)
I had the same problem with the 10.14.3 Combo Update. After my first try failed I waited a day, downloaded the Combo update and tried again, still with no success. I then installed the delta update, which worked. After that I downloaded the Combo update for a third time and ran it. This time it worked.
 


I'm not running Mojave on any of my machines, but have been archiving the associated installers and updates for possible future use.

After reading here about the problems people were having with the 10.14.3 Combo Update that I'd just downloaded on January 24, I tried downloading it again on the 25th. The second file was about 30MB larger than the first. As I said, I don't use Mojave, so can't comment on the functionality of either version.
 


David, I think it was in one of your posts where you mentioned getting the Mojave 10.14.3 installer through the App Store. I tried that on my 15" Retina MacBook Pro 11,3 (late 2013 also) and it worked. The file size was over 6 gigabytes. I made a copy of the installer before doing the installation, which went perfectly well.
However, when I transferred the installer file to my 2018 Mac Mini, the installation gave me a verification error and could not proceed. So I tried a fresh download from the App Store onto the Mac Mini, and this time it work without a hitch. Apparently, the download from the App Store links the installer file to the particular Mac acquiring it.
The 10.14.3 update apparently performed a firmware update on the Mini between the 10.14.3 combo update and the update from the full installer. Previously, the Boot ROM version was 220.240.2.0.0 (iBridge: 16.16.3132.5.1,0). Now it’s 220.240.2.0.0 (iBridge: 16.16.3133.0.0,0). Same boot ROM but different iBridge.
We keep installers for the past 7 or so macOS versions on our utility portable drives. They never ask for Apple ID and install with no problem on machines with no Apple ID or with different Apple IDs in use. I've never seen this be an issue.

Keep in mind, the OS updates download and install without ever setting up an Apple ID in the store. If it does insert some ID info into the package, I don't think it works in any limiting way. We do get a verification error sometimes and have to re-download a new one. I guess this is due to it being a defunct or problematic version or getting corrupt.
 


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