something like that, yes, also the serial key can be banned/disabled for the same reason, have been sold without authorization, you end without a os
ideally what you need to buy is a oem license, a unique serial key for each pc, i have seen offerings that cost 60 dollars for both windows 10 pro and office 2016 pro, but haven't decided yet to buy them, perhaps next year with a new ryzen pc
about rufus and windows 10 isos
i use rufus for some isos, linux, diagnose tools, but other isos gave me problems with rufus, included windows 10 isos, don't know why
so all i do is use diskpart, that always works for me
these are the steps to use diskpart
1. get a usb device you can wipe to put the windows 10 install, ideally a 8 gb flash drive and connect it to the pc
2. open cmd on windows, press windows key and r key, write cmd there and press enter
3. in the console write diskpart
4. list disk
this command will list the disks connected to the pc, internal and external ones
6. select disk x
where x is the number of the drive previously listed should be put, usually is 1 if you don't have more disks connected inside or outside the pc, you can be sure by confirming the size in mbs of the drive
7. clean
this will clean the partition in the usb flash drive
8. create partition primary
this creates a primary partition
9. active
this determines that the partition can be used to boot the pc from it
10. format fs=fat32
this will format the usb device into fat 32, windows 10 likes that partition type, this step will take some time, depends on how fast id the usb drive
11. assign
this will give a letter to the new parttion on the drive
12. exit
this closes the diskpart tool
13. doubleclick over the windows 10 iso you downloaded, this will mount it as a cd rom drive and can be browsed on explorer, if you have set your pc to open isos with 7zip or another compression tool, open it there, it is ok too
14. then select all the files and folders in the windows 10 iso and copy them
15. paste all the files in the usb drive you just prepared
when it is done copying, be sure to boot from the device, it can be a uefi bios and will find and use it to boot as a uefi usb device
if it doesn't boot this way, be sure you copied the files and not just the iso into the drive, the iso is meant to be used on a dvd, not to boot this way
after you no longer need the usb device because you installed windows 10 and you are happy with how it went, you can format it again to use it for something else or just delete files in it, and use it later with a new windows 10 iso, it is already set to be used as a boot device, all you have to do is put the desired files in it and boot from it