The giant company "Microsoft" released Windows 10 last year, on 29th July 2015, offering a free upgrade from genuine Windows 7, Windows 8 and Windows 8.1 systems. The free upgrade offer is going to end on 29th July 2016 and will have a charge of $119 for upgrades.
If you didn't yet upgrade to the new operating system, just few hours left before Microsoft stops this free upgrade and apply a nominal charge. Why to pay, when you can grab it for free?