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This was the fix for me: provided in this thread: https://forum.unity.com/threads/my-unity-projects-wont-open.1258704/
When you write .alf file, do you mean the .ulf file? OTherrwise I don't know what .alf file you're talking about Edit: Sorry, I worked it out....
I can't open projects from the Unity Hub. When opening projects, the Unity Editor splash screen shows for a moment, after which the Unity Hub is...
When I double click, or right click - open my materials, they don't open in the inspector: [ATTACH] I've been having a variety of problems with...