Will not Install...

[Sinus]

Hey, I looked at this and thought it might be cool, to bad I cant install it..

I have overviewed some threads and I can say I have the following

Counterstrike 1.6

Half-life

half-life 2

Counter-Strike: Source

The install button wont click down...

Any help???

 

[Pain]

Run Half-Life 1 once on Steam before installing.