Converting .tscproj projects to .mp3 audio format.
It should be quite straightforward to convert TechSmith Camtasia Projects to MP3 Audio Files (.tscproj to .mp3 conversion), even though it is not a conversion in the proper sense. Your options are limited to using the original software.
Use Camtasia itself, since it allows you to export its TSCPROJ projects in MP3 format.
We do not know any third-party software or conversion tool capable of converting TSCPROJ to MP3.