Ok its a nandroid back up so just download it and extract the contents of the folder. IT should be a folder inside that folder should have files like system, boot, data, etc. Take that folder and place it in the nandroid folder on your sdcard. ONCE that's done reboot into recovery, select backup/restore do a nandroid backup the advanced nandroid restore. Choose the file you put in your nandroid folder. Once done it will backup a screen and show you boot recovery etc select everything then restore. ONCE done reboot the phone and your all good. If it reboot a few times go back into recovery wipe data cache and restore the Rom again