install by putting the nav and bsp file into your maps directory..

default is 
c:/program files(x86)/steam/steamapps/common/counter-strike global offensive/csgo/maps

and put the swf file into
c:/program files(x86)/steam/steamapps/common/counter-strike global offensive/csgo/resource/flash

and put the txt and dds files into 
c:/program files(x86)/steam/steamapps/common/counter-strike global offensive/csgo/resource/overviews

thanks and credit to whoever made the lego textures. (found them in my texture folder.. not sure who to credit)
skybox by Hip Shot and converted over by Burnfingers - http://gamebanana.com/css/textures/1776
neon textures by Wolves Assault Hero - http://gamebanana.com/css/textures/2616