Confused about transferability Windows 10 to another PC

[JohnnyGui]

Hello guys,

Several threads have been made about this but there are some things I'm still confused about.

A while ago I purchased a built PC without Windows but which came with a separate Windows 8 OEM DVD which I installed on the PC. In the meantime I did a free upgrade to Windows 10.
Now I have bought an new PC for myself, again without Windows.

I read that the OEM version of Windows 8 may be transferred to my new PC, even though it's OEM. Source

However, I read that if you have upgraded to Windows 10 from Windows 8 OEM version, then you can not transfer Windows 10 to another PC.
What I don't understand is, if Windows 10 is licensed under my Windows 8 OEM product key, and the Windows 8 OEM key may be transferred, how is it still not possible to transfer Windows 10 (based on that Windows 8 OEM key) to another PC?

 

[Colif]

Typical windows helpdesk. They always seem to be the last to know

AS far as I know, all win 7 & 8 PC/laptops that are upgraded to win 10 can be moved. The only win 10 licences that cannot be moved are in Large OEM Brand name PC/laptops that come with win 10 pre installed. So if you had a new Lenova laptop with win 10 on it, it is restricted to that laptop only.

I haven't run into anyone who couldn't move licence after an upgrade.

 

[popatim]

I didn't even need to install win7 (Retail) first. 10 installed and activated using the key from 7!