Afficher plusStefano theoretically you only need to own the GT3R and the Nurburging.
Then when you enter the server it will download the mod file (.rfmod).
Can you give us the exact error description you get?
You may have some conflict with other .rfmod file.
I suggest you delete all the existing .rfmod related to either GT3 or Nurburging.
Restart the game and then enter the server again.
You can use ModMgr.exe to do so unless you aren't familiar with it. Ingame you can also do so with "manage content"
Or tried and recovered, I can access all the servers of both rf2 and other portals except this one, I don't want to be trying to uninstall mods and other things. good race to all the drivers who will take part in the event