Here is a link to a .zip file with (8) different US English TTS voices and required DLL files for Primo 2.4. There are (2) Loquendo 7 TTS voices (most natural sounding, in my opinion) and (6) Nuance TTS voices.
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EDIT: These files are for the WinCE version of Primo. Also, I recently found out that the Loquendo 7 voices don't work with all versions of Primo 2.4. The do NOT work with 22.214.171.1247029, but the DO work with 126.96.36.1995512.