I am planning to build a pretty decent gaming pc for around $600 and would like windows 8.1 for the OS. Physical copies are usually priced around $89.99 for windows 8 and up to around $120 for windows 8 pro. Microsoft lets you upgrade from windows 7 to windows 8 via download for as low as $69.99 and some 3rd party sites include a download and license. I was wondering if it is legal/possible to download the electronic copy of windows 8 from one of these sites but instead of installing it onto the laptop I would put it on a usb or disk and install it into my new build.