Hi there, thanks for reaching out to Microsoft Community. This is Arlene, an Independent Advisor.
Just to check, have you tried reinstalling the MSKLC package in a different directory or checking for compatibility issues with Windows 11?
It seems that some users have encountered similar problems when using MSKLC on Windows 11, as the tool is quite old and may not be fully optimized for newer systems. One possible workaround is to install MSKLC in a folder that does not contain spaces or short file names, as this can sometimes cause conflicts when building the keyboard file.
Additionally, some users have reported that switching to Microsoft PowerToys, which offers keyboard customization features, might be a more stable alternative.
Let me know if you need further assistance!
Regards,
Arlene D.