Night owl updating, problem opening the app

Hi all. I tried to update night owl using the updater after it went crazy with the bonk sound when I couldn't log in. It frustrated me so I removed the app, tried to redownload the app from the Mac app store. Let me tell you, that's a big pain in the butt. I swear apple made it harder with their "collection". Anyway I ended up clicking the website button, then downloading it there. After I clicked on open the zip file, it offered to put itself in the apps folder. Except it then says could not move to applications folder, with an OK, button at the end. How can I get around this?