This download looks like a map. You need to place it in your maps folder inside the Garry's Mod folder.
You should end up with a directory structure similar to below
Don't know where the Garry's Mod folder is or how to extract zip files? See more useful installation tips.
castilloelena962, qqqtrs, aubrianna, azov_wars, Zoso, Player, Agent Hunk, Kozak z Polski, claudiiode080, Chrysler.Orallo, Mike, mossesx, robertanderson556, shrek13, Areliux., Phonrage, leanhhai1559, SacredoManka, knownewsletter, alexshulski, alexshulski, umutargavan2, natanael.dph, silvasandro26061972, kelmanfidelio, $Theprototype201$, LeFrigoAnonymeDu137, Sans_ewe, Killer_Ghost360, purpleman586, re15revisited, haichhan48l0, AdrianS9, oscarandrel, Saysay, GANGSTER, RealN96, chrysler.email, frost3247, absza01, Shindou Kosuke [KROME], jose93, Saysay111, He||oween, Raptor Hawk, pokernightpros, The Jackal, newonhuu48, Skrillex, henryskyler00 +38 others
