If you are reinstalling to fix an error, deleting the main SDK folder and downloading a fresh copy is usually sufficient. Your project preferences (like the preferred text editor) are often stored outside the SDK folder, so they may persist after a reinstall.
Yes, renaming the Ren’Py folder to _old_renpy effectively disables it. This is a safe way to test if an uninstall is necessary. uninstall renpy
Right-click the folder and select , then empty your Recycle Bin. If you are reinstalling to fix an error,