Hello,
I’m sorry to see you are having this problem.
Would you mind trying the latest version (v0.1.5) of the diagnostic tool and share the its log and upm.log? We added an extra check which tries to launch the Unity Package Manager process and perform a health check. Here is a link to download:
The easiest way to do this is via the command line with the --unity-package-manager-path or -p flag e.g.
/path/to/upm-diag-win.exe -p /path/to/unity/Data/Resources/PackageManager/Server/UnityPackageManager
In the meantime, there is a troubleshoot guide that might be helpful if you haven’t tried it yet **READ ME FIRST** Troubleshooting connection/loading project issues with Package Manager