If youíre yet to try the Windows 10 Technical Preview but donít know how to install it alongside your primary Windows 7 or Windows 8.1 system, or just arenít sure on how to install the said Technical Preview from its ISO file, Microsoft would like to help you. The Windows software-maker has released tools to quickly and safely get those systems to the Windows 10 Technical Preview ahead of the preview build that is expected in January. The said tools will allow you to update your Windows 7 or Windows 8.1 system to the latest Windows 10 Technical Preview build via Windows Update in early 2015.
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See also: Prepare your PC to get Windows Technical Preview