There is no "Disk version" for garry's mod, you have to buy it from Steam
i want to play garrys mod no downloading and no buying
no because garrys mod requires that you have a game that uses the source engine
yes
you cant unless you download an add on (http://www.garrysmod.org/downloads/?a=view&id=46486)
Buy Garry's mod 10 off of steam.
Yes because you can't play Garry's mod without steam.
Yes, In "Offline Mode".
technically yes, there were a few updates it is still called Garrys mod 10 though
Garry's Mod 10
Garry's Mod has now updated and includes all features of 13 Beta
Garry's mod tornado
Steam