The most recent released version of Management by Statistics is:
The version you currently have installed can be located on the status bar along the bottom of the Management by Statistics window, as shown in the image below:
IMPORTANT NOTE: You need to use the same version of the Database Manager and Management by Statistics. That is, MBS version 3.1 works with version 3.1 of the database, version 3.1.5 works with 3.1.5 and version 3.2 works with 3.2. The Database Manager also displays its version in its status bar.