Comment by remlov

There aren't any official methods, but with a little elbow grease, several ways to run a vanilla boxed copy of Half-Life 2 are outlined in this thread: https://www.vogons.org/viewtopic.php?t=70250

I've also wanted to run HL2 in DirectX 6 as well on period correct GPUs. Specifically a TNT2 Ultra and a Voodoo 5 5500 I have laying around. I just haven't gotten around to it.