@Killian Lobato in other words, if you in the past used the Release Candidate to do online races (or you read somewhere - where? - that you had to do that) - it's no longer a Release Candidate thing. "None" is the standard build, and the online racing is available on there as Coutie mentioned - though what you want to press is the middle ONLINE section, on the main menu.
Hi thanks - removed the beta option, launched the game and steam a few times and it seams to have sorted itself out. I think I had an old installation that needed updating.