Error 0x800f0915

Hi MaksiKowalski!

This is Aeron, an Independent Advisor, Thanks for reaching out to the community.

Let me help you with your concern.

Since you’ve already tried DISM with a local ISO source and it still fails with error 0x800f0915, here are some more advanced fixes that are specific to Windows 11 24H2:

1. Use Windows Update as the repair source

Instead of pointing DISM to an ISO, let it fetch files directly from Microsoft’s servers: DISM /Online /Cleanup-Image /RestoreHealth /Source:WindowsUpdate

This has helped other users on 24H2 when ISO-based sources failed.

2. Enable .NET Framework 3.5 (and 2.0/3.0)

This often clears up service and update issues:

-Go to Control Panel → Programs → Turn Windows features on or off.

-Enable .NET Framework 3.5 (includes .NET 2.0 and 3.0).

-Run DISM /Online /Cleanup-Image /RestoreHealth again.

A sysadmin shared:

In the end I enabled .net Framework 2/3.5 … this cured the problem the update installs on the next try with no error.

3. Clean up the component store

Run these commands to compact and refresh the Windows component store:

DISM /Online /Cleanup-Image /StartComponentCleanup /ResetBase

DISM /Online /Cleanup-Image /CheckHealth

DISM /Online /Cleanup-Image /ScanHealth

DISM /Online /Cleanup-Image /RestoreHealth

Then reboot and retry.

4. Reset Windows Update components

Stop update services, clear cache, then restart services:

net stop bits

net stop wuauserv

net stop cryptsvc

ren "%ALLUSERSPROFILE%\Microsoft\Network\Downloader\qmgr*.dat" qmgr.dat.bak

ren "%SystemRoot%\SoftwareDistribution\DataStore" DataStore.bak

ren "%SystemRoot%\SoftwareDistribution\Download" Download.bak

ren "%SystemRoot%\System32\catroot2" catroot2.bak

net start bits

net start wuauserv

net start cryptsvc

Then check for updates again.

5. Install the cumulative update manually with paired files

For 24H2, some updates use a checkpoint file and main CU. Place both in the same folder and run:

Add-WindowsPackage -Online -PackagePath C:\Packages\KBxxxxxxx.msu

Where "PackagePath" folder contains both the checkpoint and CU files.

6. Temporarily disable third-party antivirus

Overprotective AV can block update processes. Temporarily disable or uninstall it, then rerun:

DISM /Online /Cleanup-Image /RestoreHealth

Security tools have been known to interfere

7. In-place upgrade via ISO “Repair Install”

If all else fails, perform an in-place upgrade using the latest 24H2 ISO:

Mount the latest Windows 11 24H2 ISO (from Microsoft's website).

Run setup.exe.

Choose “Keep personal files and apps”.

After reinstall, retry Windows Update.

Many users report this resolves recurring failures.

Hope it helps your concern. Let me know.

Regards,

Aeron C.

Independent Advisor

The error still appears. Also this command was working perfectly fine for me back in the time, but now it isn't. Any other solutions?

Hi MaksiKowalski!

I understand it seems your still having an error after all the steps provided.

For this one since I wont be able to assist you further, I will go ahead and escalate this issue to my co advisor.

Regards,

Aeron C