Ok.

I tried using that GVLK key and it didn't activate. I then put my Pro key and it activated just like before.

I associated 1511 with 15063. My mistake. Regarding Upgrade, I have 9 actually. 1st one is that Education one, 2nd to 6th are of Home and 7-9 are of Pro.

- - - Updated - - -

Education one is...

After installing new update from Microsoft Store, in "Upgrades", I can see 1 instance where it shows the Windows 10 build number to be 15063.483. My PC came with Windows 10, 1703 from the OEM itself....

Didn't know that. Thanks for the info. I thought 1 Key works only on 1 device at a time.

Considering he has retail keys which stay activated only on 1 PC at a time as well as already linked to digital license, what'd happen if he shared the photo without masking? Someone else can use it?...

Well, I downgraded that PC to Windows 8.1 as 10 lagged on it.

So they fixed the License description after 4.5 years.

:-)

Quite possible. I tried this on 1709 2 years ago.

When I used my old PC's Windows 7 Home Basic's OEM key on Windows 10 Home, slmgr/dli showed that the license has turned retail and showed the Generic Windows 10 Home key.

It shows retail license with generic key.

Even if I remove the Pro key, ShowKeyPlus still shows the motherboard embedded Home key. So, yeah, it's working perfectly here.