DISM fails in Windows 10. The source files could not be found

If, when you try to repair your Windows System Image, and  DISM fails with Error 0x800f081f, The source files could not be found, then this post may interest you.

DISM fails The source files could not be found

If the DISM Tool fails, you have 2 options – clean up the system components, and specify an alternative Windows image repair source, which will then be used to repair a corrupted Windows image. You can do this using the Group Policy.
Normally, during the repair operation, the automatic corruption repair provides files. But of this itself has got corrupted, you can use a specified repair source on your network or use Windows Update to retrieve the source files that are required to enable a feature or to repair a Windows image.

Clean up system image components

Configure an alternative Windows Repair Source
Open an elevated command prompt windows, type the following and hit Enter:
Dism.exe /online /Cleanup-Image /StartComponentCleanup
Once the operation completed,the DISM Tool /RestoreHealth command and see if it works.
If it does, great, else you will have to proceed to the next option.

DISM fails The source file could not be downloaded

The source files could not be downloaded
If you receive a Error 0x800f0906 The source files could not be downloaded message, then you will have to set an alternative source file. Read on to learn how to do this.

Configure an alternative Windows Repair Source

You can configure your system to use an alternative repair source, via a Group Policy setting, Run gpedit.msc to open the Group Policy Editor, and navigate to the following setting:

Computer Configuration > Administrative Templates > System
Now in the right pane, double-click on Specify settings for optional component installation and component repair setting.
Select Enabled and enter the Alternate source file path. You may also choose:
  • Never attempt to download payload from Windows Update
  • Contact Windows Update directly to download repair content instead of Windows Server Update Service (WSUS).
DISM fails
This policy setting specifies the network locations that will be used for the repair of operating system corruption and for enabling optional features that have had their payload files removed. If you enable this policy setting and specify the new location, the files in that location will be used to repair operating system corruption and for enabling optional features that have had their payload files removed. You must enter the fully qualified path to the new location in the “”Alternate source file path”” text box. Multiple locations can be specified when each path is separated by a semicolon. The network location can be either a folder, or a WIM file. If it is a WIM file, the location should be specified by prefixing the path with “wim:” and include the index of the image to use in the WIM file. For example “wim:\\server\share\install.wim:3”. If you disable or do not configure this policy setting, or if the required files cannot be found at the locations specified in this policy setting, the files will be downloaded from Windows Update, if that is allowed by the policy settings for the computer.
Click Apply/OK and exit.
Remember that you will need to keep and maintain a  repair source which is current with the latest servicing updates, etc, on your network.
Related tip: To use a running Windows installation as the repair source, or use a Windows side-by-side folder from a network share or from a removable media, such as the Windows DVD, as the source of the files, you can use the following command:
DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:C:\RepairSource\Windows /LimitAccess
Here you will have to replace C:\RepairSource\Windows with the location of your repair source.

Source:http://www.thewindowsclub.com/dism-fails-source-files-could-not-be-found

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