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
-
nater <-- Addon folder!
-
e.g.
-
lua
-
maps
-
materials
-
models
-
etc
- nater/
- materials/
- models/
- nater/
- weedplant_bud.vmt
- weedplant_bud.vtf
- weedplant_bud_bump.vmt
- weedplant_bud_bump.vtf
- weedplant_dirt.vmt
- weedplant_dirt.vtf
- weedplant_dirt_bump.vmt
- weedplant_dirt_bump.vtf
- weedplant_leaf_new.vmt
- weedplant_leaf_new.vtf
- weedplant_leaf_new_bump.vmt
- weedplant_leaf_new_bump.vtf
- weedplant_leaf_texture.vmt
- weedplant_leaf_texture.vtf
- weedplant_texture.vmt
- weedplant_texture.vtf
- weedplant_texture_bump.vmt
- weedplant_texture_bump.vtf
- models/
- nater/
- weedplant_pot.dx80.vtx
- weedplant_pot.dx90.vtx
- weedplant_pot.mdl
- weedplant_pot.phy
- weedplant_pot.sw.vtx
- weedplant_pot.vvd
- weedplant_pot_dirt.dx80.vtx
- weedplant_pot_dirt.dx90.vtx
- weedplant_pot_dirt.mdl
- weedplant_pot_dirt.phy
- weedplant_pot_dirt.sw.vtx
- weedplant_pot_dirt.vvd
- weedplant_pot_growing1.dx80.vtx
- weedplant_pot_growing1.dx90.vtx
- weedplant_pot_growing1.mdl
- weedplant_pot_growing1.phy
- weedplant_pot_growing1.sw.vtx
- weedplant_pot_growing1.vvd
- weedplant_pot_growing2.dx80.vtx
- weedplant_pot_growing2.dx90.vtx
- weedplant_pot_growing2.mdl
- weedplant_pot_growing2.phy
- weedplant_pot_growing2.sw.vtx
- weedplant_pot_growing2.vvd
- weedplant_pot_growing3.dx80.vtx
- weedplant_pot_growing3.dx90.vtx
- weedplant_pot_growing3.mdl
- weedplant_pot_growing3.phy
- weedplant_pot_growing3.sw.vtx
- weedplant_pot_growing3.vvd
- weedplant_pot_growing4.dx80.vtx
- weedplant_pot_growing4.dx90.vtx
- weedplant_pot_growing4.mdl
- weedplant_pot_growing4.phy
- weedplant_pot_growing4.sw.vtx
- weedplant_pot_growing4.vvd
- weedplant_pot_growing5.dx80.vtx
- weedplant_pot_growing5.dx90.vtx
- weedplant_pot_growing5.mdl
- weedplant_pot_growing5.phy
- weedplant_pot_growing5.sw.vtx
- weedplant_pot_growing5.vvd
- weedplant_pot_growing6.dx80.vtx
- weedplant_pot_growing6.dx90.vtx
- weedplant_pot_growing6.mdl
- weedplant_pot_growing6.phy
- weedplant_pot_growing6.sw.vtx
- weedplant_pot_growing6.vvd
- weedplant_pot_growing7.dx80.vtx
- weedplant_pot_growing7.dx90.vtx
- weedplant_pot_growing7.mdl
- weedplant_pot_growing7.phy
- weedplant_pot_growing7.sw.vtx
- weedplant_pot_growing7.vvd
- weedplant_pot_leaf.dx80.vtx
- weedplant_pot_leaf.dx90.vtx
- weedplant_pot_leaf.phy
- weedplant_pot_leaf.sw.vtx
- weedplant_pot_leaf.vvd
- weedplant_pot_planted.dx80.vtx
- weedplant_pot_planted.dx90.vtx
- weedplant_pot_planted.mdl
- weedplant_pot_planted.phy
- weedplant_pot_planted.sw.vtx
- weedplant_pot_planted.vvd
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