How to upgrade to Windows 10 without waiting in line | The Verge
Firstly, backup all your files and data just in case. If you're on Windows 7 or Windows 8.1 then head over to Microsoft's Windows 10 download page. If you're on a 32-bit version of Windows 7 or Windows 8.1 then download the 32-bit tool, and if you're using a 64-bit version then grab the 64-bit tool. You can check your Windows version by right clicking on My Computer or This PC in File Explorer and going to properties, and it will be listed under system type.
Thanks Verge and Tom Warren!