This is one I have unfortunately come across too many times, you notice that you can’t access BIM360 in Revit 2020, you check your version and you have plain old 2020 which is before the critical TLS patch was released. Easy, I’ll install the 2020.1 patch.
But Revit says no. Update to 2020.2 right? Well.. no. The project you’re working on for the short term is locked into 2020.1 to keep versions consistent. So what are we going to do?
Open REGEDIT, you will need admin rights for this one. Even local admin rights will do.
The browse to the following registry key
Once there, right click on the key and select find from the contextual menu and search for Autodesk Revit 2020.1.
When you find the existing registry key, simply delete it and then re-run the 2020.1 installer.