On the first step- Can you please clarify what you mean by saying you need the "Windows ISO file", also how would I find this on the Windows website? I have an iPhone, a macbook pro (just purchased, but still had old owner's apple ID as the admin, so we were forced to factory reset, but now can't reinstall OS; hence trying to install from backup), and a pc. Currently, I'm trying to just boot from the USB, but don't have a bootable file on my USB, so I need to create one, and I'm hoping to be able to do so using my PC. Hoping there is a way without paying for the UltraDMG program...if that even works.