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Recover DigitalProductId after Windows Upgrade

Hi we created a Software which uses 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId

as a part of an encryption key for a local database. The problem is that when the users upgrade from

win8->win10, 
win8->win8.1 
....

this key changes and we cannot decrypt the local database anymore.

Is it possible to read the previous value or get an event before windows is upgraded?

Solution

  • ok found something here

    HKEY_LOCAL_MACHINE\SYSTEM\Setup\Source OS (Updated on 8/1/2015 02:45:41)

    but seems to work only for upgrades to win10