>>715984425
The original release of Half-Life doesn't work on Windows 10/11.
The Steam version has been updated, the original 1998 Sierra release has not.
This is no different than how you can play Ocarina of Time on the Switch, but it's a digital emulated copy, not the original cartridge.
This is fine however, nothing prevents you from playing OOT on your actual N64, or your 1998 copy of Half-Life on your Windows 98 Pentium III PC.
SKG doesn't prevent this or require publishers to update their games for modern systems.