If you’re one of thousands like me that can’t even get Windows Update to pop out upgrade to Windows 10 from Windows 8.1 (I failed to do so from tablet, ultrabook and desktop), you can try a two workarounds:
First one if you can’t upgrade to Windows 10:
- Delete everything in %windir%\SoftwareDistribution\Download
- Search in start for cmd, right click and Run as administrator, then type in uauclt.exe /updatenow and hit enter
Second one if you still can’t upgrade to Windows 10 (that one was the only one working for me):
- Download and run ‘Media Creation Tool’ software from Microsoft for Windows 10 from: http://www.microsoft.com/pl-pl/software-download/windows10
- Proceed with installation as followed with option:
And… that’s it. Installation after few more downloads, check ins etc. should proceed with Windows 10 upgrade.