Users that installed the very first version distributed via mobiForge and maybe upgraded via WordPress will get this error all the time as WordPress includes the wrong file and then runs the function from another that includes again the same library from a different directory (the _ and - issue).

I could replicate this.

Not sure if this user falls into that category. Maybe using require_once might solve or if we see there are two directories, stop from installing and making the user clean up

Expected to have been solved by duplicate tickets.

a) the _ file will be provided but empty

b) the permissions checking is mroe rigourous prior to install

This is actually a WP bug (i.e. that it mis-reports honest activation errors as a 'redeclare' problem)