Hmmm, headsratching a bit here but there has to be a way to do it. I've got a laptop here with a dead HDD. The lappy originally came with windows 7 and was upgraded to windows 10 during the free upgrade stage. Now that the hdd drive has died I'm not sure how to go about reinstalling windows 10 again.
Any ideas?
Since your laptop was upgraded to Windows 10 during the free upgrade stage, it should still get the upgrade for free when you re-install it from here since Microsoft registers machine ID.
and if the media creation tool does not work for you, then you can always do this/not piracy