Windows 10 Pro for Workstations

This will work for you.

go to

https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-edition-upgrades

where you will see a document.  Scroll down until you see this text:

Then click the link circled as above.

You will get this page in the store.  MSFT says to click the buy link in order to re-activate the Workstations license after a re-installation or clean installation of Pro.  

I have paid on November 3 for the upgrade? 199 EUR !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1x was working. My old workstation 4 weeks later was die. Bought a new one, for over 5.000 EUR from Intel.

Windows 10 Pro work, but don't want upgrade, many time call M$, they have no knowledge, no idea what to do. I get no key from M$. It seems each new install Windows, must to buy new upgrade to "Workstation". F**k Microsoft!!!!!

That is handy. For future reference, the URL to open the page in the Microsoft Store App is: ms-windows-store://windowsupgrade/

Your new device requires a license for some Edition of Windows 10 in order to use an upgrade license to Pro for Workstations that had been purchased for your previous device.  Your Microsoft Account at https://account.microsoft.com ought to show a record of the Edition upgrade that was purchased.

Possibly you need to first purchase the same Edition of Windows 10 that you upgraded from on the previous device, unless the new device is already licensed for that same Edition.  What to do depends on the original Windows 10 Edition that was on the previous device prior to Pro Workstation and what Edition the new device is already licensed for.

This will work for you.

go to

https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-edition-upgrades

where you will see a document.  Scroll down until you see this text:

Then click the link circled as above.

You will get this page in the store.  If you are re-installing Workstation on the SAME device it was on previously, MSFT says to click the buy link in order to re-activate the Workstations license after a re-installation or clean installation of Pro.  If you are transferring to a new device you need to contact the Answer Desk by clicking the Get Help icon on your Start Menu and proceeding through the steps there.

You don't need either a key or media.  It is not different from Pro media.  The license simply turns on already installed features.  Open the Store and search on "Windows 10" (those exact words) and Windows 10 Pro for Workstations will appear.  Choose it.  Since your device is already licensed your copy of W10 Pro will upgrade to Workstations.  No downloads are needed and no payment is required since you already paid for the edition.

Very optimistic. But exact that way don't work. No upgrade to W10P for Workstations. Damn M$!!!!!