Windows 10 Build 19041 (Version 2004) language packs are primarily installed via Time & Language
Conclusion
For the vast majority of users, downloading a language pack directly through the Windows Settings menu is the safest and most reliable method. This ensures the language pack is perfectly matched to your specific build revision. Windows 10 Build 19041 Language Pack Download
To safely achieve a multilingual Windows 10 Build 19041: Windows 10 Build 19041 (Version 2004) language packs
If you have downloaded the .cab file manually and need to install it via command line: Speech Recognition or Handwriting Missing In Build 19041
In Build 19041 and later, Microsoft shifted to a modular approach. The basic language pack might install the display language, but features like Speech Recognition or Handwriting must be added separately via Settings > Apps > Optional Features.
If you cannot find a standalone language pack, you can download the full Windows 10 Build 19041 ISO in the desired language. You can then extract the install.wim file, mount it, and copy the language resources. This is a complex task usually reserved for imaging professionals.