Running MacOS 10.13.6 ((17G6030) on MacPro5,1. Downloaded zip file from both your web site and thru MacUpdate. Files identical. Unzip the file to the .app. Attempt to launch and a dialog comes up: '"Collector Movie Database.app" is damaged and can't be opened. You should move it to the Trash.'
I have tried different unzip programs with the same result: Archive Utility and The Unarchiver.
Strange, I just got it to work by removing (xattr -c) the xattributes. (The only one was the apple quarantine). Perhaps it is still corrupted, but MacOS doesn't care?
Here is the quarantine info I removed: