Half-Life 2 Garry\'s Mod Half-Life:Source Addon

and it\'s common sense really, but MAKE SURE YOU BACK-UP garry_props.txt! I can\'t stress that enough. Otherwise you\'d have to download garry\'s mod again.
Following the Counter-Strike:Source addon for Garry\'s Mod comes this pack, which, as you may have guessed, contains the models from Half-Life Source. Oh, the author doesn\'t mention in the readme,