In Universal Split Screen, alt-tab into Sven Co-op so the window is selected, then click ‘Unlock’. GoldSrc Engine games will usually not let you launch more than one instance.Launch svencoop.exe as many times as you need.Open the Sven Co-op directory by right-clicking Sven Co-op in Steam -> Properties -> Local files -> Browse game files… In options, load the GoldSrc Engine preset. Install and run Universal Split Screen: see the quick start guide.