At $99, the upgrade price would be pretty painless, especially in the face of the other option being deleting page by page
As an aside, if you are basically deleting all registrations since a particular date, just open the 3 files that contain that info (memberlist.cgi, emailsomething, etc.) and delete from there down. The delete all user files that match that info. I'd tell you specifically which files to edit but those scripts are at home on my backup drives. If you're still fishing around I'll know more late tonight (have a trash the dress session with 2 brides between now and sundown
).
Of course, make a backup before beginning
