But if you try to re-run Upgrade Assistant, it'll ask you to purchase Windows 8.1 again even if you have already purchased it.
Sometimes you may also get "Access Denied" error message in Upgrade Assistant.
Users who tried upgrading their Windows operating system using the force install method may encounter the persistent error 80240020, during installation of the Windows 10 free upgrade.
The reason you are seeing this error message is reportedly due to the overloaded Microsoft servers, which often result in incomplete or corrupt download files on your computer.
You need to perform some troubleshooting steps to resolve this issue permanently.
Here is how you could fix this error: Prerequisites Steps to fix error 80240020 while installing Windows 10 free upgrade Step 1: Go to $Windows.~BT folder in C: and ensure the Hidden items option is checked in the toolbar section of the window.
CHANGE- Calculate folder size background thread will now run even if other background thread are running CHANGE- Background thread that extract extra data can now be aborted easier.Release v7.1 (Build 2347) ( 13-May-2017 ) 35 Changes ADDED - Name generate for quick copy will now keep file extension intact and only change name part ADDED - Name shown in Copy To dialog duing quick copy will now have the generated name part selected for easy changing FIXED - Switching between advanced and simple mode, The Simple part sometimes used the wrong text for the matching part.ADDED - Added Command that canbe assigned to hotkeys that will move active tab back/forward position in the same panel ADDED - The new Rename command are now added to the menu shown when right clicking on rename button on toolbar ADDED - Custom Command "MC. Makedir" now support the quick create folder tags in the FOLDERNAME parameter ADDED - Multi Script -= operator now works ADDED - Multi Script accessing array value as right part of an operator now works ( eg: @var $x = $a $b[$idx]; ) ADDED - Multi Script Adding array item with a value to the right now works ( eg: @var $x = $b[$idx] $val; ) CHANGE- Multi Script Debugger window will now replace none breaking space with normal space (Can happen if you copy/paste script from some web browser) CHANGE- Multi Script Debugger window, The Tab size is now half.ADDED - Quick Launch Bar now has a "Run as Admin" options.ADDED - If Rename hotkey is pressed in Inline rename, It will toggle the selection part of filename/extension ADDED - Added many more rename option to the Rename submenu in menubar and context menu ADDED - Hotkey for the start of Multi Rename can now be customized ADDED - Minor change to allow Multi Commander SE to pass windows store certification FIXED - Store Edition did not show thumbnails FIXED - Store Edition did not launch MCAdmin helper process correct FIXED - Multi Script debugger sometimes caused a crash if closed before script was stopped FIXED - Fixed an issue with the "Find and Replace" and when doing ignoring case on 32bit builds FIXED - Some default settings was wrong on fresh install FIXED - "Replace all older" when moving on same volume works again FIXED - "Retry as admin" option was sometimes shown even if option of this was disabled ADDED - Renaming read only files using Multi Rename, the confirm dialog about that now have a "Do this for all read only files" checkbox FIXED - When resizing thumbnail size using mouse wheel, The scrollbar was not updated correct.