Finding your Windows Product Key

I recently purchased an Azulle Byte3 for use as my media server. I found the internal SSD that it came with was not large enough for my needs, so I purchased an M.2 which I want to use as the boot drive.

But that means installing Windows 10 on the M.2.

For that I need the Windows Product Key.

But the Byte3 does not have a sticker or other paper indicating what the product key is. So I had to search around for how to find it. The answer, it turns out, is to run the following command in PowerShell:

(Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey

That method works for machines where it key is embedded in the UEFI firmware.

If the key is stored in the Windows registry, save the following as a .vbs file and execute it by double-clicking the file:

Set WshShell = CreateObject("WScript.Shell")
MsgBox ConvertToKey(WshShell.RegRead(_
    "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion"&_ 
    "\DigitalProductId"))
 Function ConvertToKey(Key)
     Const KeyOffset = 52
     i = 28
     Chars = "BCDFGHJKMPQRTVWXY2346789"
     Do
         Cur = 0
         x = 14
         Do
             Cur = Cur * 256
             Cur = Key(x + KeyOffset) + Cur
             Key(x + KeyOffset) = (Cur \ 24) And 255
             Cur = Cur Mod 24
             x = x -1
         Loop While x >= 0
         i = i -1
         KeyOutput = Mid(Chars, Cur + 1, 1) & KeyOutput
         If (((29 - i) Mod 6) = 0) And (i <> -1) Then
             i = i -1
             KeyOutput = "-" & KeyOutput
         End If
     Loop While i >= 0
     ConvertToKey = KeyOutput
 End Function

This site is the source of the above command and code, and covers some other methods that can be used in other circumstances.