Eastern front multiplayer incompatiable issue in multiplayer

Hey guys this is my first time posting on this site.
I just ha d a question. A few mates and my self recently downloaded this mod. N ive played this before n its a great mod love it! However when we try to play it says  incompatible  version could not join. This happens once you either get invited or join a game. Cant seem to see any other people playing online either?

Were all updated to the same patch which is the latest one so it cant be a different version. If any one can help would be muchly appreciated

Did you install custom skins?

Well we actually got it running. after a reinstall and downloaded all updates again it works:). But Now my mate crashes when were trying to load a map. The erro message he gets is. There is not enough space in your temp folder. I haven't herd this one before , and now its the only thing actually stopping us from playing.

There has being no custom skins or anything added to the game. Just the updates. Any ideas?

Try to delete all the content of your temp folders to avoid this error.

1)Go to start Menu->Run->(or windows key + R)->temp
2)Delete all what you can.
3)Go to start Menu->Run->(or windows key + R)->%temp%
4)Delete all what you can.

You can use Unlocker if some file resists ;) (also you can see what process is using it and judge if it should be avoided).

Also if you have some free space to spare, you can increase the Virtual Memory.

Hey. um we tried all of the above and we still get the same message?

So completely unsure now. If you have any other ideas please let me know as were quite a big fan of this game n would like to play together.

Thanks for all the help so far:)

What are your pc specs? What OS do you have?