you can download a windows 10 image and make a usb boot image by going to the microsoft website>
https://www.microsoft.com/en-us/software-download/windows10
if your key is a pirate key then key will most likely be rejected on final activation, since the microsoft windows version will not have the hacked software to fake activation. the first phase of install only checks that the key is in the proper format, the last phase check the key against a known list of pirate keys or checks to see if the key is already in use by someone else. pirate keys fail very fast if you use a real copy of microsoft windows. if you use the copy provided by a pirate, it takes longer to fail 30 to 90 days or whenever you do certain windows updates.