Problem with Glass2K

Hello, I have a small question:

Why can’t we use Glass2K on Forza Horizon 5 to create liveries, while many painters used it on Forza Horizon 4 without any problem?

Because I can’t make new liveries, and I don’t know an other legit transparency app like that.

Thanks in advance

It works fine, I was using it today. Are you on XBox or PC?

I’m on PC. I tried with Alt+Enter…Didn’t work

Update : I found the problem : if you launch the game in admin mode, Glass2K won’t launch…Yup, I’m dumb.