Hello, I have RFactor2 for a long time but I've been doing a lot without playing, now I read that there is possibility of migrating to the platform steam, but when I try to tell me that the time has expired, does anyone know how I can do it? Thank you.
I believe the window to migrate to Steam is over. You will have to buy a Steam copy of the game now if you want any further updates.
As the person above says, there is no migration to Steam. You are currently able to use the final version from ISI (see the Legacy downloads page on the rf site) or can purchase the Steam version from Studio 397 on the Steam platform.
Try reaching out to support and see if you can still get it done. I know a couple of people who missed the email or had no access to their old email address, things happen.