To install, take the flash files you want and place them in the game's flash folder.
For example, if all you want is a square radar...
- Open tcupHUD_earlyRelease.zip using a program like 7zip.
- Find hudradarmodule.swf and put it inside Steam\steamapps\common\Counter-Strike Global Offensive\csgo\resource\flash
Note: if you want an extra, you'll have to rename it before moving it.
For example, if you want a round radar...
- Rename hudradarmodule_Round.swf to hudradarmodule.swf