That's interesting - I came here to see if I could find out why the directory /Users/%YourUserName%/Library/Application Support/MacInformer/updates was stuffed full of .dmg files, as I supposed that they ought to be automatically deleted after updating.
Many times - more often than not - updating could not be achieved via the Mac Informer app. Would I be right in guessing that in these circumstances the dmg.file downloaded via Mac Informer would remain abandoned and undeleted in the "updates" directory?