fort_combine.zip

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
          • data <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• data/
  • adv_duplicator/
    • post combine .txt

Pugsworth, Gamer2001, m.kuranda, sadfto3, ★♛☠۞ЂΊΰӘÐяäģǿמ۞☠, andergsli, o.W.n Merasmus, satio95, www.zip252, Ozanna1985, LogicalCookie, Za Warudo, makenipipo, ( ͡° ͜ʖ ͡°)ZENGAMING.COM, benjaminl1984, The Dark Cloud, DJ-sona, ckrist.almeida, rdgblagoevgrad, Elleonora, VAC NOTRE DIEU :P, ☣[DFS]jcash☣, pitzo, serianox, Neo, adid, enes-al4141, Royer300, இDeaderDinerஇ, [SGC]koolguy2758|Trade.TF, riza4, pim15, xXx_MLGNoscoper_xXx ( ͡° ͜ʖ ͡°), ahmetylms53, Chinoro777, G., [K]umul[K]umul(TR), saba, 감귤 작작먹어, Brony Sniper, ikosmid, Mertopix