No, remove the quarantine flag on the command-line (find how on Google).
Remove it or use it? If I don't use it, it will not work.
You can go into system settings and then privacy and security to allow the app to run also. Attempt to start the App once and click cancel and then go into system settings.
You don't remember
xattr -d com.apple.quarantine the_file
off the top of your head? What do you mean the command line is obtuse and hard to use?