Windows 10 inherits either retail or OEM form the Windows 7 or Window 8.1 it was upgraded from. But it also shares the license with the upgraded product and you can't run that bot at the same time. So the seller should have given you the Windows 7 media.
When I upgrade a preinstalled (OEM) or retail version of Windows 7 or Windows 8/8.1 license to Windows 10, does that license remain OEM or become a retail license?
If you upgrade from a OEM or retail version of Windows 7 or Windows 8/8.1 to the free Windows 10 upgrade this summer, the license is consumed into it. Because the free upgrade is derived from the base qualifying license, Windows 10 will carry that licensing too.
If you upgrade from a retail version, it carries the rights of a retail version.
If you upgrade from a OEM version, it carries the rights of a OEM version.
Full version (Retail):
- Includes transfer rights to another computer.
- Doesn't require a previous qualifying version of Windows.
- Expensive
Upgrade version (Retail):
- Includes transfer rights to another computer.
- require a previous qualifying version of Windows.
- Expensive, but cheaper than full version
OEM :
OEM versions of Windows are identical to Full License Retail versions except for the following:
- OEM versions do not offer any free Microsoft direct support from Microsoft support personnel
- OEM licenses are tied to the very first computer you install and activate it on
- OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard
- OEM versions cannot be used to directly upgrade from an older Windows operating system
What happens if I change my motherboard?
As it pertains to the OEM licenses this will invalidate the Windows 10 upgrade license because it will no longer have a previous base qualifying license which is required for the free upgrade. You will then have to purchase a full retail Windows 10 license. If the base qualifying license (Windows 7 or Windows 8.1) was a full retail version, then yes, you can transfer it.
From the end user license agreement:
15. UPGRADES. To use upgrade software, you must first be licensed for the software that is eligible for the upgrade. Upon upgrade, this agreement takes the place of the agreement for the software you upgraded from. After you upgrade, you may no longer use the software you upgraded from.
17. TRANSFER TO ANOTHER COMPUTER. a. Software Other than Windows Anytime Upgrade. You may transfer the software and install it on another computer for your use. That computer becomes the licensed computer. You may not do so to share this license between computers.