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"Hi:   I don't know if deleting those files will \"break\" something or reduce your protection (we'll need to wait for a Malwarebytes staffer to weigh in on that).   But, yes, with the current version of MBAM Consumer, database updates are incremental, even for MBAM Free. (Unless there have been a large number of missed databases since the previous update.) (Database updates have always been incremental for the paid, Premium version.)   So it's certainly NOT necessary to delete the previous update file. And it doesn't sound like a good idea to do so. It's a \"long run for a short slide\", as you're going to a lot of trouble for little/no gain.    If I were you, I would let MBAM take care of its databases and not try to fiddle with them. If you want to start fresh, then the best approach would probably be a clean reinstall, as explained here.   Malwarebytes staff and forum experts may have some additional or different advice for you.   Thanks, "
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