Project open

Hello to everybody ,
I opened a test project in version 2021 / 3.1 but I have a license of 2021 / 1.1. I can’t open it in an older version.
Can I do something about it?

Why not open it in a 2021 R 3.1 Xojo, even without a valid license?

I can’t generate the application and it can’t load again

Not much, recreate the GUI to avoid problems, copy/paste code.