Windows升级后恢复DigitalProductId

Question

Hi we created a Software which uses 嗨，我们创建了一个软件，它使用

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

as a part of an encryption key for a local database. 作为本地数据库加密密钥的一部分。 The problem is that when the users upgrade from 问题是，当用户从

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

this key changes and we cannot decrypt the local database anymore. 此密钥已更改，我们无法再解密本地数据库。

Is it possible to read the previous value or get an event before windows is upgraded? Windows升级之前是否可以读取先前的值或获取事件？

Answer 1

ok found something here 确定在这里找到了一些东西

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

but seems to work only for upgrades to win10 但似乎仅适用于升级到win10