Microsoft is auto-downloading 6GB to your PC without permission
If you’ve noticed that your PC’s hard drive is a little cramped lately, it might be because Microsoft is automatically downloading between 3.5GB to 6GB of Windows 10 installation files …
Just in CASE you want it (you do) they're downloading between 3.5GB and 6GB of installation files onto your system if you have Windows Automatic Updates enabled.
Apparently, if you delete the files… they'll just get downloaded again. For those of use without ridiculous data caps that's not that big of a deal if they do it when you're not using your computer. Still, I believe in OPT-IN instead of opt-out. If you want to opt-out you can disable Windows Automatic Updates or follow the steps outlined here: http://www.howtogeek.com/228551/how-to-stop-windows-7-or-8-from-downloading-windows-10-automatically/