This download looks like a lua file. You need to place it in your lua 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.
MitsuhaOn300FPS, LaZik, cl_interp 5, Natalka, [BC] [MG] JulianDieEnte, CyberGman, Zmooth, Napp, Jack Chan, Vito Scaletta, [GER]lars_pro, Bastian Obsullivan, africanlady96, ☆G R ≡ M S☆, BelugaCat69420, Artur__Vargas, Chuckleheadly, пупсик, Daffodil Yogurt Sups.gg, не ШЕВЦОВ, samueldylon161, The Fisherman, nolove, Ario133_YT, Лютый_zxc, VEE, ADD?, 0WEL, абу бандос, adi, frinqius, Am Yalayıcı, snoɯʎuouɐ, shayers01, Magic, PixelGordyE, Shirus, ArchAngelLloyd, axfermm10, axfermm10, Anger, DJ | TheRaven, Zef0us, Hernas, SI, SOY UN OSO, Jantiki, melinaverbois, TrojanArab, hermess6667, Jorge Do Chocolate +9403 others
