Error 0.2.0 - the checksum of the game database does not match.

There may be several reasons for this:
- your version of the game does not match the version of the player who created the game you are trying to join (either they have version 3.0, or you have version 3.0; in this case, you need to install patch 3.1);
- either you or they have a mod installed in the game folder in the UserMODs directory;
- move all maps from the Maps directory in the game folder to another location. The standard maps will still be available for play (this sometimes helps).

Try it!