I found a way around the MacOS bug on 4.5.20. I downloaded a script called "Gatekeeper" and it allowed me to run the app.
Contents of the script:
#!/bin/bash
# Bash Menu Script Example
RED='\033[0;31m'
GRN='\033[0;32m'
BLU='\033[0;34m'
NC='\033[0m'
echo ""
echo -e "GateKeeper Helper Brought to you by ${RED}NMac.to${NC}"
echo ""
echo -e "${RED}Options 1: Disable Your GateKeeper means${NC}"
echo -e "${RED}You can completely disable your gatekeeper >> Good For Professional User.${NC}"
echo ""
echo -e "${RED}Options 2: Enable Your GateKeeper means${NC}"
echo -e "${RED}You can completely enable your gatekeeper >> Good For Newbie User.${NC}"
echo ""
echo -e "${RED}Options 3: Allow Single App To ByPass The GateKeeper means${NC}"
echo -e "${RED}If you don't want to completely disable your gatekeeper then allow an${NC}"
echo -e "${RED}individual app to pass it >> Recommended For All Users.${NC}"
echo ""
echo -e "${RED}Options 4: Self-Sign An App means${NC}"
echo -e "${RED}If you don't want to disable SIP and your app is quite unexpectedly especially${NC}"
echo -e "${RED}under the recent macOS then try to Self-Sign your app using this option.${NC}"
echo ""
PS3='Please enter your choice: '
options=("Disable Your GateKeeper" "Enable Your GateKeeper" "Allow Single App To ByPass The GateKeeper" "Self-Sign An App" "Quit")
select opt in "${options[@]}"
do
case $opt in
"Disable Your GateKeeper")
echo ""
echo -e "${GRN}You Choose To Disable Your GateKeeper${NC}"
echo ""
echo -e "${RED}Plaese Inseret Your Password To Procceed${NC}"
echo ""
sudo spctl --master-disable
break
;;
"Enable Your GateKeeper")
echo ""
echo -e "${GRN}You Choose To Enable Your GateKeeper${NC}"
echo ""
echo -e "${RED}Plaese Inseret Your Password To Procceed${NC}"
echo ""
sudo spctl --master-enable
break
;;
"Allow Single App To ByPass The GateKeeper")
echo ""
echo -e "${GRN}You Choose To Allow Single App To ByPass The GateKeeper${NC}"
echo ""
read -e -p "Drag & Drop The App Here Then Hit Return: " FILEPATH
echo ""
echo -e "${RED}Plaese Inseret Your Password To Procceed${NC}"
echo ""
sudo xattr -rd com.apple.quarantine "$FILEPATH"
break
;;
"Self-Sign An App")
echo ""
echo -e "${GRN}You Choose To Self-Sign An App${NC}"
echo ""
read -e -p "Drag & Drop The App Here Then Hit Return: " FILEPATH
echo ""
echo -e "${RED}Plaese Inseret Your Password To Procceed${NC}"
echo ""
sudo codesign -f -s - --deep "$FILEPATH"
echo ""
echo -e "${RED}If you see - replacing existing signature - that means you are DONE!${NC}"
echo ""
echo -e "${RED}Otherwise there is something wrong with the app or its path${NC}"
echo ""
break
;;
"Quit")
break
;;
*) echo "invalid option $REPLY";;
esac
done