I just downloaded the plugin recently… version 3.7. I don’t see any more current downloads available.
The code in the original post i grabbed from the TribeEventsFilter_Category.php, as i thought that was connected with the public $type = ‘select’ function which that filter has available. I’ve returned to the original code from the TribeEventsFilter_Venue.php, only changing the public $type from ‘checkbox’ to ‘select’ as you suggested. This is where i resolved yesterday, and it does not process the filter. Visually it appears as drop down, but when an item select i get spinning wheel like its trying to process but does not.