1) Extract the files and put them on your home/ Counter-Strike server folder. (Where your HLDS file is located)
2) Go to the file cstrike/addons/amxmodx/configs/plugins.ini and put at the bottom of the file 2 lines:

            pimpspug.amxx
            stats_pug.amxx

3) Restart Server / Change Map
4) Make sure to put in amxmodx/configs/maps.ini the maps you want to come up in the map vote