Possible to use/run an xbox game downloaded from anywhere besides xbox.com?

In short: I’m cheap, don’t have enough money to trade in my xbox for a worthwhile gaming pc, and I want to download a game (for the xbox 360) not from the xbox marketplace, put it on my flashdrive, and play it on my Xbox 360.

In long: For the longest time, I have purchased games from the Xbox Live Marketplace, well over $100, not to mention my console and accessories. Now I wish to download and run games from a third-party (proper use of term?) website, similar to how one does it for the classic Xbox. With my old Xbox, I could just put the game onto my flashdrive (modded memory slot port :smiley:) and run the game from there.
I wish to do the same (or at least something similar) on my Xbox 360.

So:

download game from site other than xbox.com
put on flashdrive
???
Profit!

Well, not profit, unnecessarily waste days on a game I’ll only play about 30 times, until there is an update.

Is it possible? If so, how to do it?

I am familiar with using Horizon, no probs there
I have yet to try to do it, too much hassle to waste hours figuring out that it is impossible or something like that.

Thank you! :thumbsup:

I suggest you invest in a chipped Xbox 360 (JTAG/RGH).