So i have my MW3 installed on my computer and it works with 4D1. And now I copied game to another pc to play with my friend and I log in with different 4D1 account.

 

When I start the game, I need to have Steam running. But when I start Steam I get Error like:

You have to buy this game to play it...

 

Do you know how to fix this problem?

Yes, read the error, every bit of it.

Buy the *game* or viewtopic.php?f=30&t=11192 for some steam check bypass information

i think your problem is solved so now lock this

Buy the *game* or viewtopic.php?f=30&t=11192 for some steam check bypass information

i think your problem is solved so now lock this

 

How is it solved? He has not responded at all. Please stop acting like a tech support when you aren't.