Game extensions show games 'Unavailable'

Hello forums

I bought Garry’s Mod for my friend today, and he has been having trouble with his Half Life 2 Episode 1, Day of Defeat Source, and Half Life 2 showing up in his game extensions. Though, CSS has no problem showing up, neither does Portal, HL2dm, and TF2.

The games are fully installed, updated, and recently played on, but when he goes to add them to GMod prop base, they show UNAVAILABLE. We tried searching for specific props from that game, it shows up for me, not for him (in menu search) and he sees errors and missing materials from those games, while I have no visual problems.

If anyone has had this problem before, and/or knows how to fix it, please post :slight_smile:

Thank you~