Upgrade to Windows10 failed!

[stsalkit]

I do not understand what goes on with the update: up to recently I had a folder supposing to hold the downloaded windows 10 files with the size of around 6 Gb. Next time I looked the size went back to 140mb AND the Windows 10 update started downloading! I just don't get it. What happened to all those GBytes?

 

[albertan_bear]

How to delete that Windows temporary folder (I'm administrator, but it says I need admin privileges)? And can I delete Windows.old folder.