I have a question. I bought Rfactor 2 years ago as Livetime Subscritpion. 2017 It then switched to Steam but I never received the email because it has landed in the spam folder. is the possibility that you can switch to Steam or is that too late and I have to buy it again
But you DID receive the email. You just didn't 'see' the email. I think McFlex's answer is your best bet. There have been several others like you over the past few years. Good luck.
Try contacting Christopher Elliott here at the forum. Check one of the official announcement threads, almost always posted by him. Then click on his picture to the left of the post. You should be able to send a private message to him.