How to obtain the original windows 10 product key which came installed in the device?

[VipashaAwasthi]

I had upgraded to Windows 10 educational version about a year ago.  The product key was provided by the university, which I assume would expire soon that I have graduated recently. I had not saved my original product key while upgrading. Now I want to move back to the original home version which came installed in the device. Could someone please guide how I could obtain my original windows 10 product key? I could not find it anywhere on the HP packaging of the laptop

[erico]

@VipashaAwasthi 

The original HP key is stored in the BIOS unless you cleared the HP keys setting. The only way to get that key would be to remove the Windows 10 Educational  installation hard disk and install another one and do a clean install of Windows 10 via an HP Cloud Recovery USB flash drive.

The Windows 10 Educational version  license key will not expire. Your university just does not have that kind of control over your life.  🙂

The following Virtual Basic script will give you the installed key if run while logged into Windows. It is safe to use and run.  Copy and save it in notepad and save as ProductKey.vbs. Double-click it to run the script.

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

edited for a typographic error by Erico