Windows 7 and windows 8.1 users are now beginning to see a ‘Get Windows 10’ icon in there system tray. This can be used to reserve a copy of Windows 10 for when it is released on the 29th July 2015. The download size is about 3 GB. Reserving yourself will enable you to download the update in advance of the 29th July release date. A partial reason for the role-out method might be to gauge how heavy the traffic will be when Windows 10 is released. Windows 10 will be a free upgrade to those users running Windows 7 and Windows 8.1.