I'm removing the Dynamic Dropdowns extension from the MySQLi version of DataBridge. The functionality can be replicated by using Framework builder and plugins and AJAX, which will be the preferred method for adding dynamic select lists in the new version. I'll have to do a tutorial on how to get it done.
I will do a screen sharing session and show anyone how to add a MySQLi dynamic select using Framework builder and AJAX if they will agree to do a tutorial on the topic after.