Newbie here

Should I install games first before using horizon?
I want to download games i use ISO2GOD to convert my downloaded tekken tag 2 iso then I use horizon and save it on my flashdrive but when I insert it on my xbox 360 e it says the game is corrupted can anyone help me?

It’s not working because you don’t have a modified 360. You can’t just add games that way and expect them to work. You need a Jtag or RGH modified 360 to do that.