I've been using Shredder successfully for several years. Yesterday I downloaded (multiple times) the latest version of Shredder and stupidly trashed my old version. When I went to use or open this version of Shredder I received the message "You cannot open the application "Shredder" because it may be damaged or incomplete." Mr. DeKorte has not responded to my email requesting help. So, my advice is to keep your prior version if it's working. If you want to try the newer version, for goodness sake do not toss the prior version!

BTW: I've downloaded and expanded other software yesterday so I doubt if my OS or Stuffit is at fault.