(KB5064081) (26100.5074) Failed to install - 0x800f081f

Hi....

I've been trying to install 2025-08 Cumulative Update Preview for Windows 11 Version 24H2 for x64-based Systems (KB5064081) (26100.5074) for the last five days.  It downloads okay.  But when I try to install it, that's when the fun starts.  It installs up to 25% and then sits there for a while.  Then it starts installing again and zooms up to 88%, then it pauses for a few seconds.  It then zips up to 100%, but then I always get the error message "2025-08 Cumulative Update Preview for Windows 11 Version 24H2 for x64-based Systems (KB5064081) (26100.5074) Failed to install - 0x800f081f."

I've tried a lot of solutions I found online.  But I have yet to find a solution that downloads / installs the update and finishes completely successfully.  No matter what solution I try it always ends up in the scenario I mentioned above.

The solutions I have tried in the last five days are listed below.

1 - Windows Update Troubleshooter, which failed to run.

2 - Reset Windows Update components:

net stop wuauserv
net stop cryptSvc
net stop bitsnet stop msiserve
Rename your update folders by running this code:
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
Run the following commands to restart the update components:
net start wuauserv
net start cryptSvc
net start bits
net start msiserver

3 - Ran SFC and DISM to repair corruption in an elevated Command Prompt:

Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /RestoreHeal

4 - Manually downloaded the update from the Microsoft Update Catalogue and installed the update.

5 - Outbyte PC Repair.

6 - Downloaded to the SSD and mounted the ISO Windows file, while keeping my files, apps, etc.  

7 - Performed an "In-Place Upgrade", with wiping the disk and not keeping my files, apps, etc.  Therefore wiping the SSD clean.

The PC involved is:

ASUS Viviobook E1504FA (laptop)
AMD Ryzen 5 7520U with Radeon Graphics

8.00 GB (7.28 GB usable)

Windows 11 Home 24H2 - OS Build 26100.4946

Would anyone have any ideas / suggestions that I can try to get this update installed successfully?

Thank you.