Well you still have time Janus67, as I posted earlier, they moved the clock up by 23 hours, expiration time is now 4am Central.
I went inside BIOS on a brand new setup and just because you can check for the latest BIOS version inside BIOS that doesn't mean you have internet inside Windows which still may needed a manual motherboard LAN driver to connect.
I was blissfully unaware of this so I hat to offline phone activate my Windows 8 retail which I wanted to install first.
By the way on two identical laptops, one one I first removed Antivirus and Firewall software and had no problems, on another I left them and UAC is not allowing me access to storage drive folders.
Uninstall all antivirus and firewall software before upgrading to 10 is my takeaway.
Reinstall them manually.