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In the "normal CD-edition" of SS1 there is a german speech for every mail... But why not on the enhanced editon?
This question / problem has been solved by voodoo47image
they are in - make sure you are using the latest build (redownload if necessary).
Thank you, that got it fixed.
Just some information.

In the game folder you can find the original DOS CD version as .bin image. Just burn it onto a CD and you can play it on your DOS retro gaming PC.

When installing it that way you choose the language during the installation. Cool release :)