Told me I had the right requirements for CS:S so I bought it (for Gmod) and started downloading. It got to about 5min left, and then it said it stopped downloading because I suddenly didn't have the requirements. And of course the Steam Support didn't do stuff...
So yeah. :IThere totally should
But no, he pissed me off big time and he knows it, he shouldn't be trying to buy me off.
they updated the engine and didn't update requirements on the store page
you could still probably make it download and just mount it for the css models/textures/etc in gmod
css itself is a bad game anyways
and i downloaded the l4d2 demo when they had it on my formerly working laptop and it said it couldn't run it but didn't yell at me and stop downloading, just warned me when i launched it