How to upgrade Win7/Win8.1 to Win10 9926 using Windows Update

Win7 and Win8.1 users want to experience the stunning debut of Win10 9926. In order to facilitate the majority of users, Microsoft has released Win7/Win8.1 to upgrade Win10 preparation tools through Windows Update. Win7, Win8.1 first join the "Windows Insider preview version of the plan", download and run the corresponding version of the upgrade Windows10 preparation tool.

It is recommended that you back up the system before upgrading, so that problems can be restored to the original system after the upgrade. If you forget to back up, you can re-download the Win7 ISO image with the Microsoft Software Recovery website. In addition, Microsoft also added the function of rolling back to the original system in the upgraded system startup menu, and can use the windows.old generated after the upgrade to the original system.
When you go to the Control Panel's Windows Update and look for updates, you'll find an update called "Windows Technical Preview". As shown in the figure:

The update is huge enough to be around 3GB, so you should be prepared to download and install it for a long time. Then click the “Install” button to wait patiently for the download to complete the installation. And after upgrading to Win10 9926, generally do not need to re-activate, Win10 9926 will retain the original Win7/Win8.1 key activation status (this may be Microsoft's Win7/Win8.1 free upgrade to Win10 policy advance preview). If Win10 9926 suddenly becomes inactive, follow the Win10 Build9926 activation tutorial to do it.
Many Win7 and Win8.1 users want to experience this new version directly, but there is no other version number of Win10 in their own computer. It seems very difficult to upgrade directly from Win7 and Win8.1 to Win10 9926. In fact, Microsoft has already considered this point, released the upgrade Win10 preparation tool, everyone can upgrade to Win10 9926 through Windows update, eliminating a lot of troublesome download, installation and other operational steps.