Windows 11 update 24H2 reaches 100% download and then fails. What is the reason for this?

 First, Go to the settings and then go to Windows and security section.

Then, disable the Real-Time Protection Off from the Virus & Threat Protection.

then, if that don't work then disable the memory intetrity from Device Security.

https://answers.microsoft.com/en-us/windows/forum/all/windows-11-update-24h2-reaches-100-download-and/4b834a3c-8312-4db8-a676-f21e76bcbbed