
Later on I connected to the Internet and installed some updates.
When it asked for the product key, I entered the Windows 7 Pro OA product key on the PC's sticker and it worked, mind you I did this with no Internet connection. I didn't have the administrator password for Windows 7, so I installed a fresh copy of Windows 10 (on a new/blank SSD I installed on the PC) using Microsoft's media creation tool through USB.
Pick, Assemble and Install: Video Guide.
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