This article provides the information on "Windows 10 upgrade fails with error 0x80240020".
A small number of Dell system users have reported that their 7/8.1 systems encountered an upgrade failure with an error of: 0x80240020.
Working with Dell technical support, it was determined that running the Windows update troubleshooter in Windows 7/8.1 will resolve the issue and allow the Windows 10 upgrade to proceed successfully. (See Figure 1.)
Figure 1. - Opening the Windows update troubleshooter from Control Panel, All Control Panel Items, Troubleshooting, All Categories
Article ID: SLN298478
Last Date Modified: 08/01/2017 09:10 AM