64-bit Language Module installers & 64-bit Language Interface Packs for Windows Embedded 8 Standard. Details Note: There are multiple files available for this download. Language packs are normally available for download via Windows Update. Microsoft does release standalone update packages in.cab cabinet files format in the form of DVD ISO image, typically to volume licensing customers, MSDN or TechNet subscribers and OEM partners, which can be used for offline installation or slipstream into Windows 7 ISO image.
Support.microsoft.com › En-us › TopicLanguage Packs Are Available For Windows 8 And For Windows RT
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Update For Windows 8.1 (KB2938301)
I would suggest you to refer the suggestion provided in the article mentioned below and see if it helps you to fix the issue.
If issue persists, try to boot the computer in clean boot and disable security software temporarily and then try to add the language pack as there could be chance that some security software or some startup items is restricting it to get added.
Step 1: Perform Clean boot.
Putting your system in Clean Boot state helps in identifying if any third party applications or startup items are causing the issue. You need to follow the steps from the article mentioned below to perform a Clean Boot.
Windows 8.1 English Language Pack
How to perform a clean boot in Windows
Note: Refer 'How to reset the computer to start normally after clean boot troubleshooting' to reset the computer to start as normal after troubleshooting.
Step 2: Disable Security software temporarily.Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.
Hope the information help. Please let us know if the issue persist and we will be happy to assist you.