How to do 80240020 error code after upgrading win10

Win7/win8.1 update 80240020 error after win10? The Win7/Win8.1 user who has subscribed to Win10 upgrade may encounter 80240020 error prompt in Windows Update when upgrading the system. This error usually occurs in the system installation file. Appears when the download is complete and is ready for installation.

According to the answers from Microsoft's Q&A community officials, the reason for this error is:
Under normal circumstances, users need to first confirm the interaction through Windows Update through Windows Update, Microsoft said that because this is the history The biggest software upgrade, hope to provide users with a better user experience. Microsoft has not yet prepared for all devices. It is recommended that users who have not received the upgrade notification wait for a while until the system starts to upgrade.
This problem may occur because many users have previously forced the system to start the upgrade by command, but have not confirmed it through the upgrade reminder. For users who encounter the 80240020 error message, if you want to upgrade immediately, you can try to modify the registry by:
• Open the run by Win+R, enter regedit to open the registry editor;
• Navigate to
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionWindowsUpdateOSUpgrade
• Create a new DWORD (32-bit) value named AllowOSUpgrade on the right side, double-click the new value to set its value to 1, as shown below:


After the modification is complete, open the Windows Update of the system and check the update. At this time, you should be able to upgrade Windows 10 by clicking the “Start Update” button.
Note: Windows 8.1 users need to open Windows Update in the traditional control panel instead of Windows Update in the Modern version.