So, I turned on my PC, (its pretty new, got it like 4 months ago) and opened up Unity Hub, it opens, I click my project, and then… nothing
what’s wrong, I’m using unity 2020, its just not working
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I managed to fix this by going to AppData/Roaming/ and delete UnityHub folder
@elilittrell
You can go inside the location that you save your projects then double-click on the folder go into Assets and find your scene then double click on any of the scenes that you have and Unity will start to boot up it might take some time and then it will open up and you can then work on your project.
Hope this would help 
@elilittrell
Don’t be sorry it’s ok. I have another way open Unity Hub then click on the settings icon and check if the editors path is setup correctly in case you renamed it and forgot to update in unity hub then click on save. Then after that on the extreme-left there will be written license management click on it and then click on check for updates. Then try opening your project if it does not work click on your account in the top-right corner and maybe report a bug.
I am very sorry to reply that much late it was night here 
Copy The “Your Project” then Paste on C: Drive (Main)
Reinstall unity from the hub
I would recommend the latest “official release” (not prereleases)
I created a new project, then from top left menu “Open Project”, then tried twice to open the previous project. Weird error first saying D:/Program does not exist. Second time, the project launched.
@elilittrell I tried everything but nothing worked. So in my case there was one dll file missing vcruntime140_1.dll. I downloaded it and saved it in System32 folder.
On windows 11 I had to uninstall all copies of unity and even unity hub itself. After reinstalling my unity version (wihtout any additional modules) I was able to get my project to open.
It happened with me, when i installed a new editor, 2020.3.27f something, and it was opening at all, even I tried to open it directly with an empty project.
I ran a command via CMD, it generated a file and it worked afterwards:
“Unity.exe editor full path in strings” -batchmode -createManualActivationFile -logfile