OpenRA

I'm trying to play in multiplayer. When i start the game and connect to the server , it says "incompatible version". The thing is, on both pc i got the same version that i just downloaded from the site. i also try doing an online game with a password, but it shows incompatible also.

what could be the problem ? thanks

Are you sure you are not accidentally starting an older version that was installed before? The version is visible in the top right beneath the logo in the main menu, so you can check there if the versions are the same. I would try completely uninstalling from both PCs and then reinstalling.