[Resolved] Windows 10 Upgrade fails with 80240020

Windows 10 Upgrade fails with 80240020 causes missing .dll for update. Because newer version of update always carries some new advancement and system file support. The encryption can’t be identified at a glance. Its compatibility requirement starts to search exact prototype within the sys files of Windows Operating System. Some numbered KB codes are recommended to repair the old one may be helpful. Other general reasons which are encountered by the PC during update requests are bad registry of Windows Operating System, corruption of Win sys files in last update, disconnections or server protocol impairments including time constraints, firmware failure etc. With the help of a third party say “Advanced System Repair Tool” existing problem of Windows 10 Upgrade fails with 80240020 can be removed from the system easily.


{Compatible with Windows 8, 7, XP, ME, Vista, 98, 2000 (32/64)
File Size: 4.9MB Download Time: <(dsl, 2sec, dialup 2min)>}

There is a manual solution can be tested as self attempt given below:

  1. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade (to locate the upgrade request on root directory)

*If it doesn’t exist then

Define Word (DWORD 32-bit) Name = AllowOSUpgrade >> set the Value = 0x00000001.


{Compatible with Windows 8, 7, XP, ME, Vista, 98, 2000 (32/64)
File Size: 4.9MB Download Time: <(dsl, 2sec, dialup 2min)>}

Conclusive Decision :

The manual solutions are easy to specify in either case for Windows 10 Upgrade fails with 80240020 problem trash out. If user faces difficulty “Advanced System Repair Tool” can help for easy banish while providing privilege to the PC viz. defragmentation, cache memory speed enhancement, user’s suitable personal settings on desktop, malware and firmware alerts, redundancies removal, technical support for new updates, virus diagnostics and remedy in a single click.


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