I've deleted everything regarding 2.08 (Turns, fatherland files, etc) and it will not load. The turn hasn't advanced at all. It has stayed on the same turn, though other games in 2.08 have advanced on the server.

So, the 2.06 game did not advance or change turns. But other games on the server (it has 3) have been modified to use the 2.08 dom2.exe and advanced a turn. (If that's clear)

Will this make it incompatable?

Still the same error. I have restarted and cleared temp files in case it was something in the Cache or similiar and it still gives the same error message.