Can't open projects in 2018.2.2f1,Unity can't open in 2018.2.2f1

I downloaded Unity today on Windows. When I opened it, I got this error:
I clicked Try Again and it just popped back up. I click Force Quit and it quits obviously. But when I click Cancel, it opens up the Unity project selector thing. But the problem is, this is all that happens:

I sit and wait for a while, but nothing new happens. How can I fix it?

I had similar problem long time ago. I added permissions to folder with unity for my windows profile and it worked.

Just allow administrator access to files and if that doesn’t work you can then check if your antivirus isn’t blocking any of the permissions to the files.