How to fix Windows update error 0x8024402F (WU_E_PT_ECP_SUCCEEDED_WITH_ERRORS) (Nothing else worked)

If none of the other solutions worked, and you don't want to reinstall your operating system, perform a System Restore. This feature returns Windows to a certain restore point back in the past when your computer was working properly, and a restore point has been made, without affecting your documents.

To restore your computer:

1. Go to the start menu and type System restore;
2. Click Next;
3. Select a restore point;
   *You can also check the Show more restore points box to see all the restore points stored on the system.
   **Click the Scan for affected programs first, which will show you what programs have been installed after the restore point was created.
   
   
4. Wait for the process to complete;
   
   

Note: Do not interrupt the process to avoid irreversible software damages and data loss. If you use a laptop, connect it to the AC adapter before you start restoring Windows.

A last-resort option to fix error 0x8024402F is reinstalling the device's operating system. Reinstalling the operating system will remove all the corrupt files, viruses, and restore your computer to the state as it was when you purchased it.

Before you reset your computer, make sure to make a backup of your personal data (pictures, music, videos and other invaluable documents) to an external hard drive, or to online backup solutions like Google Drive, OneDrive, to avoid losing them irreversibly.

Feel free to check out the how to install an operating system guide to learn how to (re)install your computer's operating system, safely, if you have never done it before.