Comment by vee-kay
You don't need to launch your GOG game via Steam, you can just remove its shortcut from Steam and launch it separately. Then your son can launch and play the Steam game in parallel, so both of you can play coop.
You don't need to launch your GOG game via Steam, you can just remove its shortcut from Steam and launch it separately. Then your son can launch and play the Steam game in parallel, so both of you can play coop.