"“Favtool.app” can’t be opened because Apple cannot check it for malicious software."
"This software needs to be updated. Contact the developer for more information."
This is explained in readme: “Whenever FavTool is run for the first time, the message "Apple can’t check app for malicious software" might be shown. In order to run favtool ctrl-click the app and select "Open"”
"“Favtool.app” can’t be opened because Apple cannot check it for malicious software." "This software needs to be updated. Contact the developer for more information."