I think I have the same problem. I change from RStudio-pro-1.4.1717-3 to RStudio-2021.09.2-382, and could not install any package, because something was wrong with PATH, HOME with non recognized French accent. Hence I could not install Rtools or any other package. I desinstall the latest version and reinstalled the old one. Do you think that by installing these 2022.02.0 version it should work?