What should I do if I upgraded win10 9926 for a long time to check for updates?

However, some users found that when using the downloaded Win10 preview version of the 9926 official ISO image to cover the upgrade installation, they encountered a long time stuck in the "Check for Updates" step. User rubycon pointed out that before the upgrade, you should first disconnect the network connection, and then use the downloaded image to install and upgrade. A friend who has encountered this problem can try to solve it according to this method.
In addition, when Microsoft released the Win10 preview version of the 9926 official ISO image file download, it also gave a list of known issues of Win10 preview version 9926, and promptly pushed the January technical preview version update, recommend users to upgrade to Win10 After previewing version 9926, install the update as soon as possible.