I purchased freerider since the beginning, and has been a while since i used it, now in my Library says "You haven't purchased anything yet" I can not download it, do I have to purchase it again
No you don't have to purchase it again. Make sure you are using the same email address that you used to purchase it, your purchase is linked to your email address.
As a developer, I do not have direct control over downloads/purchases, if you are still having trouble accessing your download I would suggest contacting the staff at Itch:
