All steam games update themselves automatically.
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You can buy it at the Steam Store. Check the related link.
10 is better, $10 Steam
Install steam (steampowered.com) and you can buy it on there. $10 and you get automatic updates through steam and servers.
i recommend the vavle pack valve is the creators of steam if u have good gameing PC tho and garrys mod but u must have some of the valve games to play garrys mod great game!
no because garrys mod requires that you have a game that uses the source engine