1° Open Terminal.app, change directory to AutomountMaker.app parent folder and check quarantine's attribute
sh-3.2# xattr -l AutomountMaker.app
com.apple.quarantine: 0000;4d023750;Firefox;|org.mozilla.firefox
2° You can remove quarantine's attribut with command below
sh-3.2# xattr -dv com.apple.quarantine AutomountMaker.app
3° Check absence of quarantine's attribute
sh-3.2# xattr -l AutomountMaker.app
Just for fun…
You can renew quarantine with
xattr -w com.apple.quarantine "0000;4b3a40d0;Safari;|com.apple.Safari" PATH_TO_FILE