Need Help :)

Hi i havent bought Gmod 10 yet so im going to try garys mod 9 but i have a little problem also tell me if what is have is okay to use

but when i click on gm9.exe to play which i have installed then it tells me

‘Failed to launch gmod_9_0.exe’

why is this could someone please tell me thank you im new to this

Uhh, you might have installed it wrong or downloaded a bad version, I’d try to re-download and install.

actually he was being a fool and tryed to use demo’s and pirated hl2 and cs:s and legal non source versions of things for the support.