Updating ipod version
i Pad has a SGX535 which is a 2 gigaflop GPU, the latest i Pad air has a G6430 with over 115 gigaflops.
Even if you manage to manually install the software it probably won't even turn on without crashing.
It will let you download any application without the message about you ios.
It will then on your i Pad say do you want to update to the newest version and click no.
Apple is usually very consistent in UI design, mirroring whatever is in the OS in the applications.
All 64-bit devices can run i OS 11, though some don't have every feature available to them.