FLStudio using the latest release.
4.Reset your FLStudio settings.
5/Windows - If the User data folder is set to a location inside Program Files, Windows may prevent FLStudio access and so FLStudio will fail to start. Reset ...
after trying to fix and the project using the diagnostic tool then comes up with a box saying this : Project file was not fixed (header and file empty)I also don't have a backup folder in FlStudio 20 ...