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
-
tiberium <-- Addon folder!
-
e.g.
-
lua
-
maps
-
materials
-
models
-
etc
- tiberium/
- lua/
- autorun/
- entities/
- lynix_tiberium_blue/
- cl_init.lua
- init.lua
- shared.lua
- lynix_tiberium_bluefield/
- cl_init.lua
- init.lua
- shared.lua
- lynix_tiberium_green/
- cl_init.lua
- init.lua
- shared.lua
- lynix_tiberium_greenfield/
- cl_init.lua
- init.lua
- shared.lua
- lynix_tiberium_radar/
- cl_init.lua
- init.lua
- shared.lua
- weapons/
- gmod_tool/
- stools/
- tiberium_radar.lua
- tiberium_tower.lua
- materials/
- models/
- props_gammarays/
- cargo_containegdi.vmt
- cargo_containegdi.vtf
- cargo_container02.vmt
- cargo_container02.vtf
- tiberium/
- TiberiumCrystal.vmt
- TiberiumCrystal.vtf
- TiberiumTower.vmt
- TiberiumTower.vtf
- models/
- props_gammarays/
- cargo_containegdi.dx80.vtx
- cargo_containegdi.dx90.vtx
- cargo_containegdi.mdl
- cargo_containegdi.phy
- cargo_containegdi.sw.vtx
- cargo_containegdi.vvd
- cargo_containegdib.dx80.vtx
- cargo_containegdib.dx90.vtx
- cargo_containegdib.mdl
- cargo_containegdib.phy
- cargo_containegdib.sw.vtx
- cargo_containegdib.vvd
- tiberium.dx80.vtx
- tiberium.dx90.vtx
- tiberium.mdl
- tiberium.phy
- tiberium.sw.vtx
- tiberium.vvd
- tiberium.xbox.vtx
- tiberium01.dx80.vtx
- tiberium01.dx90.vtx
- tiberium01.mdl
- tiberium01.phy
- tiberium01.sw.vtx
- tiberium01.vvd
- tiberium01.xbox.vtx
- tiberium05.dx80.vtx
- tiberium05.dx90.vtx
- tiberium05.mdl
- tiberium05.phy
- tiberium05.sw.vtx
- tiberium05.vvd
- tiberium05.xbox.vtx
- tiberiumtower5.dx80.vtx
- tiberiumtower5.dx90.vtx
- tiberiumtower5.mdl
- tiberiumtower5.phy
- tiberiumtower5.sw.vtx
- tiberiumtower5.vvd
- tiberiumtower5.xbox.vtx
- changelog.txt
- info.txt
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