The instructions for installation floating around are:
To play the alpha delete or renamed the "...\Half-Life 0.52\Half-Life\Opengl32.dll" file and then run "...\Half-Life 0.52\Half-Life\enginegl.exe".
Strictly speaking I'm not sure if this is allowed but pretty much every other HL news site is posting it as well. In the reddit thread the guy writes:
a valve employee messaged me a week ago about it, I told him to check, he never replied so if they don't care then I don't care
You can read more about it in this Reddit thread and even bid on the disc if you wish.
If anyone does get it working then it would be great to see some screenshots!





















