I spent 3 or 4 days downloading rFactor2 just to try the new Sebring 2018. Now it wont work. I cant manually manage it thru workshop because it is not there. It is not in packages either. I read somewhere that I would have to uninstall the 13Gb download and redo everything from begining. But if it fails I loose the 48hs refund period. Any advice of what should I do?