It turned out there was an issue with the version 2.0 release for Macs, as the build system missed some files. The end result was that text files could not be imported.
This has now been fixed.
If you downloaded Biodiverse for the mac prior to 19-Feb-2018, then please download the updated version.
https://github.com/shawnlaffan/biodiverse/wiki/Downloads
Shawn Laffan
19-Feb-2018