Microsoft released Windows 10 Technical Preview release build: 9926 for the people registered under Windows Insider Program. This January 2015 release adds new features including Cortana support, enhanced UI and a set of other stuffs. Find the steps mentioned below to download the Windows 10 (build: 9926) to try the new features coming in Windows 10. Also, ISO links are available for offline installation.
If you are already part of the Windows Insider Program and already installed Windows 10 Technical Preview, you can download the January release build #9926 by following the below steps:Press “Win + C” to bring
the charm bar
Click “Settings” and then “Change PC Settings”
Click on “Update and recovery” menu item and then “Preview builds”
If it shows “Download new preview build” at the right panel, click “Download now” button to start the download process. Once it downloads the latest build, it will start the installation process automatically keeping your apps and settings intact.
Alternatively, you can download the offline version of the build and do the manual process to install the Windows 10 build : 9926 in your system. Remember that, it’s currently comes under Technical Preview and hence there could be lots of development bugs still...(Read whole news on source site)