Each time I update Windows 10 I run in this. After updating Windows tells me it needs activation, and clicking “Activate” does not help. Neither does entering the license key
NKJFK-GPHP7-G8C3J-P6JXR-HQRJR found on the page where I downloaded the original ISO from. The error I get when entering that key is that it is not applicable to this edition of Windows.
Apparently although I thought I had downloaded from the above link, turns out I had not. That link is for the Tech Preview but turns out I had downloaded the Enterprise Tech Preview (from here). The key for that is
PBHCJ-Q2NYD-2PX34-T2TD6-233PK – enter that and now it activates.
One way of entering the license key is simply search for “Activate” in the Start Menu or Cortana. That will take you to Control Panel where you can enter the license key and activate.
Another way is to open Command Prompt and type:
slui 3. This will open a window to enter the license key and activate.
Lastly – and my favorite way – is to open Command Prompt and type:
slmgr /ipk PBHCJ-Q2NYD-2PX34-T2TD6-233PK. This will install the new product key and also activate Windows. Just for reference you can also only activate Windows by typing: