Note: it is a legal company machine. Unfortunately, my co-worker responsible for the keys isn't reachable any more. But I (representing my employer) am legal user of the keys in that currently non-bootable Windows 10 installation.
- I have a damaged, non-booting, but activated Windows 10.
- I have also a booting, working, but not activated Windows 10.
- I want to activate (2) with the license key of (1).
How can I get the license key from (1)? Important: I can't boot this install, but I have full access to its hard disk (as the administrator of (2) ).
Note 2: After the key is found, (1) will be deleted.
Result: Finally I reinstalled the Win10 with the OEM Win7 license key on the bottom of the laptop.