
With Windows 10, version 1803, we started to deliver language translation improvements via Local Experience Packs referred to as LXPs. Local Experience Packs are AppX packages delivered via the Microsoft Store that enable users to experience Windows features like the Start Menu, Settings, and File Explorer in the language of their choice. We also continued to support cabinet file-based language packs (lp.cab) and Language Interface Packs (LIPs) via language pack ISO files distributed with Windows 10. Please see these related guides: How to fix error 0xc1510114: The wim file needs to be remounted, Error 0x80070002: When trying to mount an image file, Error code 15601: How to resolve DISM unspecified error when removing preinstalled packages,
License files are composed of lines listing specific information, such as the server name (SERVER) or quantity of licenses. Here is another error resolved you may want to see: Error 0xc1420127: The specified image in the specified wim is already mounted for read and write access, and Error 740: Elevated permissions are required to run DISM.
The error code below was as a result of entering a wrong path when installing the Local Experience Packs (LXPs).
Error: 0xc1570103
The license file was not found in the specified path.
The license file must be located with the .main file in the directory specified by the /FolderPath option. If a license file is not required, use the /SkipLicense option. For more information, see help.
The DISM log file can be found at C:\windows\Logs\DISM\dism.log

To resolve this issue, please ensure the path to the license file is correct, and ensure the script is correct as shown below.
dism /image:G:\Path-to-the-mount-file\MountZ /Add-ProvisionedAppxPackage /packagepath:G:\Path-the-LXPs\de-de\LanguageExperiencePack.de-DE.Neutral.appx /licensepath:G:\Path-to-the-License\de-de\License.xml
Note: Admins who want to add additional LPs to the Windows image before deployment can choose between .cab files and LXPs for the May update.
I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.