Windows 10 Installation: How to Fix 80240020 Installer Bug
Navigate to the C:WindowsSoftwareDistributionDownload folder and erase all the data in it.
Click on the Start button, search CMD and right click on the icon and choose Run as Administrator.
The command prompt will appear on the screen. Type wuauclt.exe/updatenow and press Enter.
Now, the update screen will appear on screen, check for updates and the dialogue box will prompt as it has began downloading the Windows 10.
Once the downloading is complete, the system will prompt Preparing for installation, which means your system is ready to be updated
