Confused over Source SDK Mods

[Yosiah]

I made a thread about a year ago where I was trying to decide between buying Team Fortress 2 and Left 4 Dead, because I wanted to play Zombie Panic Source. Well, the outcome of that thread was me buying Team Fortress 2 (a few weeks before it eventually went free to play) and I happily downloaded Zombie Panic Source from Steam.

Now, however, when I go to the steam page for the mod (through the steam program, with my account logged in) it doesn't give me an Install button for the game because I don't own a "Source SDK" game. Well, I'm pretty sure when I paid £14.99 for TF2, I was buying the Source SDK, and my steam profile has Zombie Panic Source on the played list.

Any ideas?

 

[Yosiah]

That's ridiculous if true. I bought it when it was an SDK game, for the sole purpose of playing mods. I'll have to contact Steam and complain