I own two separate computers, and as it happens i also have two boxed versions of platinum collection supreme commander.
So now my friend comes to my home and we try to play a game together 1vs1 locally just to realise we cant join lobby if both are on the same account. So ive created another account to login on second computer and now i get this error of having to login from account linked to steam.
Note that i have phisycal copies of the game not steam ones.
Is there any way around this problem?