Mafia II Pack P1

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • mafia2 <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• mafia2/
  • materials/
    • models/
      • mafia2/
        • ascotbailey/
          • Ascba_cr.vmt
          • Ascba_cr.vtf
          • Ascba_cs.vmt
          • Ascba_cs.vtf
          • Ascba_cs_n.vtf
          • Ascba_in.vmt
          • Ascba_in.vtf
          • Ascba_n.vtf
          • Ascba_r.vmt
          • Ascba_r.vtf
          • Ascba_r_glass.vmt
          • Ascba_r_glass.vtf
          • engine_compartments.vmt
          • engine_compartments.vtf
          • gplc.vmt
          • gplc.vtf
          • gplc_n.vtf
          • wheel_univers_d.vmt
          • wheel_univers_d.vtf
          • wheel_univers_n.vtf
        • cop/
          • eyeball_l.vmt
          • eyeball_r.vmt
          • MIP_CPOLI1d.vmt
          • MIP_CPOLI1d.vtf
          • MIP_CPOLI1sn.vtf
          • MIP_CPOLI2d.vmt
          • MIP_CPOLI2d.vtf
          • MIP_CPOLI2sn.vtf
        • joe/
          • eyeball_l.vmt
          • eyeball_r.vmt
          • JOEOBLD2d.vmt
          • JOEOBLD2d.vtf
          • JOEOBLD2n.vtf
        • vito/
          • Copy of VITOL1d.vtf
          • eyeball_l.vmt
          • eyeball_r.vmt
          • pupil.vmt
          • pupil.vtf
          • VITOH_001d.vmt
          • VITOH_001d.vtf
          • VITOH_001n.vtf
          • VITOH_d.vmt
          • VITOH_d.vtf
          • VITOH_n.vtf
          • VITOL1d.vmt
          • VITOL1d.vtf
          • VITOL1n.vtf
  • models/
    • mafia2/
      • cop1.dx80.vtx
      • cop1.dx90.vtx
      • cop1.mdl
      • cop1.phy
      • cop1.sw.vtx
      • cop1.vvd
      • joe.dx80.vtx
      • joe.dx90.vtx
      • joe.mdl
      • joe.phy
      • joe.sw.vtx
      • joe.vvd
      • vehicles/
        • ascotbailey.dx80.vtx
        • ascotbailey.dx90.vtx
        • ascotbailey.mdl
        • ascotbailey.phy
        • ascotbailey.sw.vtx
        • ascotbailey.vvd
      • vito_coat.dx80.vtx
      • vito_coat.dx90.vtx
      • vito_coat.mdl
      • vito_coat.phy
      • vito_coat.sw.vtx
      • vito_coat.vvd

GabeMaxii, gary.muriel261, yousefhamdan2007, yousefhamdan2007, Revolt, datboionline, John Mullins, Mark, W1Z4RD0, {SaD}GoldenSnowTurtle{HT}, The Mailman, Camilliou, The Damn Train, Kool Kid Konnor, Korchagin2005, Dante_Gamer, ✪ Xyleath, GG Ashy The Neko, Bando [FR], Cap'n Sinkles, (MLG) Mr Ryder, artem10112005, artem10112005, artem10112005, Haze All Cops are Bastards, tssthesplitscreen, MD.cz, Шаунди, fenixbelinham, darwinxjerio, , ToroKiller35, josueloki_, jessegalan10, Ben 10, Pepsi Crystal, davidpesl14, Chris ˘ — ˘, Ricama | THE GREY DINOSAUR, TropasPT, BluffinMuffin, flyer22012, byLocks™, PTRCC, santi.damico, portemonnee_snaaier_98, nicobolino, Remember Ace? yea, me neither, heatsaber, nong_man_u46 +229 others