Win 7 Home Prem to Win 10 Update Error 0x80070057

[offthemark]

I'm trying to update from Win 7 Home Premium to Windows 10. I keep getting through the download but get a 0x80070057 error when the update starts. I've tried doing a clean boot, removing McCafee, and have installed all Windows updates.

 

[zcomputerwiz]

Hello and Welcome! Please try running the upgrade using the tool here: Windows 10

If the upgrade fails, please attach C:\Windows.~bt\Sources\Panther\SetupAct.log with your reply.

 

[offthemark]

I started the update but it is asking for the product key. This was the free Windows download that had its availability end recently so I'm not aware that I have a key. Do I install without the key and will I be able to activate later?

 

[zcomputerwiz]

Try using your Windows 7 key :)
If it is accepted, you can do the update - if not then unfortunately your free upgrade period is over.