Hello,
What is the patch number you are trying to download? Have you tried to download in Microsoft Update Catalog?
Have you tried to reset the Windows Update components? If not, please refer to this link:
Additional resources for Windows Update - Windows Client | Microsoft Learn
Performing a clean boot. This is a way of starting Windows with only the essential services and programs, which can help eliminate any software conflicts that might interfere with the update process. Please refer to this link: How to perform a clean boot in Windows - Microsoft Support
Check if there is enough disk space available on your system drive. If not, free up some space and try the update again.
I hope this helps.
Best Regards,
Hania Lian