Unreliable App

“The Application is damaged, please download a fresh copy from our website” Unreliable app and customer serviced!I have tried the update, still get the message App is damaged message. Removed and reinstalled from my Macbook Pro late 2013 model, OS X 10.9.5 serveral times and still get the message. Wall Paper Wizard does not work!

YY**ZED about Wallpaper Wizard: HD Wallpapers Collection