So it is that time again and honestly every time I forget how to convert projects.
Is it a bp or c++ project?
Blueprint only.
I always do it like that -> go to documents/unrealprojects/yourproject/right click on the uproject file/switch unreal engine version
After that it should work
you can also open the new version of the engine then click the project at the project screen and it gives you the options.
Thank you.