gm_botmap_v3.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
          • gm_botmap_v3 <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• gm_botmap_v3/
  • addons/
    • gm_botmap_v3/
      • info.txt
      • maps/
        • gm_botmap_v3.bsp
      • materials/
        • gm_botmap_v3/
          • Map/
            • texture.vmt
            • texture.vtf
          • slider/
            • texture.vmt
            • texture.vtf
            • texture2.vmt
            • texture2.vtf
        • maps/
          • gm_botmap_v3.vmt
          • gm_botmap_v3.vtf
        • xuras/
          • gm_botmap_v3/
            • advert/
              • advert1.vmt
              • advert1.vtf
              • advert2.vmt
              • advert2.vtf
              • advert3.vmt
              • advert3.vtf
              • advert4.vmt
              • advert4.vtf
              • advert5.vmt
              • advert5.vtf
              • texture.vmt
              • texture.vtf
            • blueprints/
              • blueprint1.vmt
              • blueprint1.vtf
            • plane/
              • texture.vmt
              • texture.vtf
            • users/
              • alfie.vmt
              • alfie.vtf
              • ben.vmt
              • ben.vtf
              • christoffer395.vmt
              • christoffer395.vtf
              • dotmister.vmt
              • dotmister.vtf
              • kenjirus.vmt
              • kenjirus.vtf
              • nadanova.vmt
              • nadanova.vtf
              • paper-burn.vmt
              • paper-burn.vtf
              • px1k.vmt
              • px1k.vtf
              • rabbish.vmt
              • rabbish.vtf
              • redsnappa.vmt
              • redsnappa.vtf
              • sleepy.vmt
              • sleepy.vtf
              • soul-chicken.vmt
              • soul-chicken.vtf
              • thingshappen.vmt
              • thingshappen.vtf
      • models/
        • xuras/
          • gm_botmap_v3/
            • advert/
              • Advert.dx80.vtx
              • Advert.dx90.vtx
              • advert.mdl
              • Advert.phy
              • Advert.sw.vtx
              • advert.vvd
            • map/
              • Map.dx80.vtx
              • Map.dx90.vtx
              • map.mdl
              • Map.phy
              • Map.sw.vtx
              • map.vvd
            • plane/
              • plane.dx80.vtx
              • plane.dx90.vtx
              • plane.mdl
              • plane.phy
              • plane.sw.vtx
              • plane.vvd
            • slider/
              • slider.dx80.vtx
              • slider.dx90.vtx
              • slider.mdl
              • slider.phy
              • slider.sw.vtx
              • slider.vvd
      • particles/
        • particles_manifest.txt
        • waterfall.pcf
      • settings/
        • maps/
          • gm_botmap_v3.txt
        • spawnlist/
          • [botmap].txt
  • particles/
    • particles_manifest.txt
    • waterfall.pcf

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