This seems different from the issues I've seen before - perhaps related to your library being in a shared folder. Maybe a permissions issue?Joe, FYI... I've installed Mojave and Aperture in a VMWare Fusion virtual HD for the sole purpose of running Aperture after I upgrade to Catalina. I moved my Aperture photos library to the macOS/VMware shared folder, but I've been unable to open it in Aperture in VMWare Fusion. I receive the following Aperture error message when I attempt to open the Aperture photos library: "Unable to write to library 'Aperture Library 2".
Aperture itself opens without a problem in the Mojave virtual machine. It just can't seem to access the Aperture photos library. I'd appreciate anybody's thoughts on how to solve this problem.
The issue I normally see reported is that Aperture will launch just fine and will open the library and display thumbnails of your photos, but you can't open/view the full-size images. The error reported is that the [virtual] computer you are trying to run Aperture on does not support the minimum graphics requirements.