exract files from this RAR into your 
"...\steamapps\common\Counter-Strike Global Offensive\csgo" folder,
and merge the two folders contained within: "maps" and "resource".


Best played as arms race. 

To play the map as arms race with bots:
Open the colsole in CSGO. Usually "~", but you might have to set it up in the "controls" option of CSGO.
when the console is open type "game_type 1" and hit enter
then type "map ar_lostruins" and hit enter. you should be good to go!

Special Thanks To JorisCeoen!
For creating the custom radar and load screen images, Thank You!