The mac app is corrupted and can't be opened. You should move it to the trash

operating system:

macOS High Sierra 10.13.4

"sizeUp.app is damaged and cannot be opened, you should move it to the Trash" after updating sizeUp.app

Solution command:

Open terminal and executesudo spctl --master-disable

This command turns on the "Any Source" option of "Allow apps downloaded from" in "Security and Privacy";

After successful installation, close the commandsudo spctl --master-enable