You need source sdk 2013 and right click: Goto properties and hit beta set it to upcoming and install the game into your source mods folder use 7 zip or win rar to extract. Make sure its singleplayer
Another Alpha or i guess patch since someone said it was broken.
Still goes nowhere. Some fix.
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Half Life
HL2
Alpha
Gordon
Alyx
Mod
Fun
Still goes nowhere. Some fix.