In trying to create a new Project in RStudio 2024.09.1+394 , after giving it a Directory name as required, I get a message "The system cannot find the file specified"
I have re-installed the same version several times with the same characteristic results.
Are you on a Mac? I have had troubles "finding" files due to MacOS restrictions, specifically allowing RStudio access to specific folders in the Files & Folders section of the Privacy & Security tab in System Settings.