I cannot download Window 11 25H2.I tried many times but unsuccessful.

To resolve the installation error 0x800f081f when trying to download Windows 11 version 25H2, you can try the following steps:

1. Run the Windows Update Troubleshooter: Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters and select Windows Update. Run the troubleshooter to identify and fix any issues.
2. Check for Corrupted System Files: Open Command Prompt as an administrator and run the command sfc /scannow. This will scan for and attempt to repair any corrupted system files.
3. Use the DISM Tool: In the Command Prompt, run the following commands one by one:
   • DISM /Online /Cleanup-Image /CheckHealth
   • DISM /Online /Cleanup-Image /ScanHealth
   • DISM /Online /Cleanup-Image /RestoreHealth This can help fix issues with the Windows image.
4. Ensure You Have Enough Disk Space: Make sure that your device has sufficient disk space available for the update.
5. Manually Download the Update: If the above steps do not work, consider manually downloading the Windows 11 version 25H2 update from the Microsoft website.

If you continue to experience issues, you may want to contact Microsoft Support for further assistance.

References:

• Windows 11, version 25H2 known issues and notifications
• Resolved issues in Windows 11, version 25H2
• Windows 11, version 24H2 known issues and notifications
• Windows 11, version 23H2 known issues and notifications

Hello G Padmanabhan, thanks for posting this in our community.

The error 0x800f081f during Windows 11 25H2 installation usually means CBS_E_SOURCE_MISSING, which indicates missing or corrupted system components.

First, make sure you have at least 20 GB of free disk space, disconnect any non-essential peripherals such as USB drives or printers, temporarily disable or uninstall any third-party antivirus software, and confirm that TPM 2.0, Secure Boot, and UEFI are enabled in your BIOS.

Next, run these commands in Command Prompt (Admin):

sfc /scannow

DISM /Online /Cleanup-Image /RestoreHealth

If the issue still persists, I recommend performing a manual installation using the Windows 11 ISO. You can check this How to run In-place upgrade in Windows 11 for detailed steps.

Kind regards,

John Oli

Hello,

You can try manual upgrade using Windows 11 25H2 ISO file.

Follow these steps: 

Download Windows 11 25H2 ISO from the official Microsoft website.

Double click on it to mount it to a DVD drive.

Then go to DVD drive, double click on setup.exe to proceed.

Follow on-screen instructions to complete upgrade.

For detailed instructions, refer this step-by-step guide:

https://www.kapilarya.com/how-to-upgrade-to-windows-11-version-25h2

Let us know if this helps!

Note: Included links in this reply refers to a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.