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I have laptop that come with windows 8 installed and I install windows 10 on the same hard drive (in new partition) using same product key.

I want to keep windows 8 and don't want to use windows 10 right now but I install it to get free upgrade before 29/07/2016 (the last day for free upgrade)

my question is : is that ok or my product key will be blocked.

NOTE:

  • Now both windows are activated
  • Original windows 8 is Single Language OEM
  • I install windows 10 using bootable flash drive that I made it by Media Creation Tool downloaded from Microsoft site.
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    At any given time you are only allowed to have Windows 8.1 or Windows 10 installed on the machine. If you have both installed then you are in violation of EULA. – Ramhound Jul 13 '16 at 16:27
  • @Ramhound, Thank You, I think I will reset my laptop to its original Windows 8. – Fadi Jul 13 '16 at 16:41
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If you use the free upgrade system (via Windows Update, Media Creation Tool or standalone installation media), Windows 10 will overwrite your Windows 8. It is the purpose of an upgrade: it replaces what already exists with something newer.

However, you will still be allowed to install and activate Windows 10 with a Windows 8 key. However, you won't be legally permitted to have both Windows 8 and 10 installed (even if they are not used) with the same key at the same time. And IIRC, you are not even allowed to permform a clean install with an OEM key.

  • Thanks @Nathan, so now I have to delete one windows 10. can i then install windows 10 using windows 8 key after 29/07/2016. – Fadi Jul 13 '16 at 13:38
  • Your key will still be valid after 29/07. If you perform a clean install or an upgrade from a regular installation media (a Windows 10 DVD) you shouldn't have any problem. – Nathan.Eilisha Shiraini Jul 13 '16 at 13:51
  • I'm Sorry @Nathan but in your answer you said you are not even allowed to permform a clean install with an OEM key and in comments you said that I can if I have regular installation media (a Windows 10 DVD) . I install windows 10 using bootable flash drive that I made it by Media Creation Tool . is my flash drive is regular installation media?. I edit my question to add this. – Fadi Jul 13 '16 at 14:04
  • What I meant was, Windows will let you upgrade your installation from Windows 8 to 10. Past 29/07, you won't be able to download it from Microsoft Update, and you will need an installation media. If you wish to upgrade, then a USB key from Media Creation Tool will work. Obviously you have to make sure nobody will erase the contents of that key between 29/07 and the moment you upgrade. – Nathan.Eilisha Shiraini Jul 13 '16 at 14:09
  • Thanks @Nathan,its clear now and you answer my question but I have new question and I know from StackOverflow that asking questions in comments is not good way so i will post new question. – Fadi Jul 13 '16 at 14:17

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