It is an year since windows 10 launched on July 29th, 2015. The software giant has offered its latest OS to Windows 7 and Windows 8.1 users as a free upgrade for the past year, but that offer is about to run out.As today is 29th of July, you have only a day to upgrade(Hawaii time 12 AM) and after that MS would start charging for Windows 10 upgrade.
As far as GWX is concerned, it would be taken away after an update scheduled on Patch Tuesday:
And for the ones preparing for the last minute upgrades,
Just select upgrade this PC option.
I would recommend backing up the data first. Go ahead and good luck!