I think their Linux support is still in beta. You might need to opt into the beta (if they let you) to be able to install. If you contact the game developers they should be able to give you more info.
Hey!
I cannot opt for beta. but I think that indeed that may be the problem. I will try to contact the game developers.
Thanks
http://steamdb.info/linux/ reports "Signs of Linux Support" for Space Hulk. This means that the steamdb site detected elements of a linux version but there is not enough for the game to potentially be working (yet).
Thanks for the info.
Nothing extracted yet.
I just bought Space Hulk and it doesn't install. Even if I remove the local files and then select install again, it appears instantly as installed in the games list. Running it says "Failed to start game ( missing executable )". I tried verifying local content and it didn't work.
I installed some games a few weeks ago and they are working well.