According to your description, the issue is more related to MRTK install failed. To help you better, I suggest that you could post issue to Mixed Reality forum.
Hope this helps and please help to accept as Answer if the response is useful.
MRTK error "Failed to retrieve the package catalog. Please check your internet connection and try again"
I have already checked that I have the latest version of windows 10 installed on my PC, and that I had the latest version of .NET installed. I have tried reinstalling the MRTK launcher and restarting my PC. I know my internet connection is working. I have tried creating Unity projects with version 2019.4.21, 2019.4.19, and 2019.4.16, but none of them work.
Same here. Tried both 2019lts and 2020lts, not working.
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