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But why would it work via the upgrade path? When I upgraded from Mojave to Catalina it was running great.
I ended up having to upgrade to Parallels 15 for my VM to work smoothly under Catalina. What's weird is when I upgraded from Mojave to Catalina...
Initially I created a windows VM under High Sierra on my mid-2015 MBP using Parallels 13 and everything was running great. I have an external 4K...