To install this map.
Just copy all the contents into your computer
Local Disk
Then go to programs x86 on modern computers
scroll down to steam
then click on steamapps
(Your name/account)
garrysmod
click on maps
and paste content.


From Then go to programs x86 on modern computers (optional)
also go to steam
steamapps
common
GarrysMod
click on garrysmod again
click on maps
and paste in maps as well.