When you use this with 3.8 and apply the db change you get a php warning complaining that the contents were already being sent back to the browser when it reached the header(..) function in the dbprefix_admin.php (line #49). As such this plugin cant redirect the page to show the final results.
I checked the database for all the changes (to confirm that everything went ok) and indeed it did.
So besides having a visual problem and not indicating to the user that all went well this plugin works. But for the average user they will rightfully think its broken so it should be fixed.