Hi I did all the steps and it now opens and I no longer get the "can't be opened" message but it doesn't actually fully open for me.
Like I get the bouncing icon on the dock as if the apps about to open but then it just bounces back off and doesn't open and that's everytime I try to open the app.
(I'm not sure that fully makes sense but I think that best way to describe it lol).
Thank you for helping all of us mac users though we appreciate it!