If you are searching for "No JTAG" because you have a newer console, you are actually looking for RGH. While RGH requires hardware modification (soldering or a plug-in glitch chip), it is the only way to truly play any installed game file (ISO or GOD container) without a disc.
You can purchase games directly from the Xbox 360 Marketplace (note that some features of the store may be limited as Microsoft transitions support). If you are searching for "No JTAG" because
Before diving into the "how," it is crucial to understand what your Xbox 360 is actually doing when you "Install a game to Hard Drive." If you are searching for "No JTAG" because