Ehh, that's like the 4th time in one month?
About the client-server mismatch: it's possible you're playing on a server that has installed a version of IU 1.2 in a folder called "instaunlagged", which is wrong. But the solution is to just delete your instaunlagged folder and type cl_allowdownload 1 before connecting (copy the ip adress first and type /connect and then ctrl+v to paste the ip). Disable autodownload again when you're done connecting.