How to install a radar?
Un-zip the archive you have downloaded. This can be done by right clicking on the downloaded archive (.zip file). If the file ends in .rar you might need WinRAR to un-zip it. Inside the un-zipped folder there should be file(s) ending in .spr. Those are sprites. The full names of the sprites can be: radar640.spr or\and radaropaque640.spr. Now copy the .spr file(s). Find your cstrike folder and open it. Inside there should be a folder named sprites. If there isn't a folder named sprites you must create it! Open the sprites folder and paste in the sprites (.spr files). If you are asked to replace any files click "Yes."
You have now installed your new radar.