How are you trying to run it (there are different methods)? Make sure it's in the root of your sd card. Power off then hold vol down and power button until it boots. It should take. Maybe try downloading it again and checking that the MD5 sum matches.
Just trying to help man, not saying you don't know or haven't tried these things.
Thank you for all your help it's greatly appreciated. I will download again and see if that works