I found if you do it twice it'll work. The first time i just got the verification error with "move to bin" or "cancel", but when I did it again by right-clicking/open, it gave me the option to open as well as the other two.
try this: right-click, then hold the Alt (Option) key, then click Open.
if you want to make it so you don't have to right click, then select open, you can run sudo spctl --master-disable
sudo spctl --master-disable