Can't even OPEN the game?!

So I've only been playing for a few weeks now and it's been working fine until last night when the app just stopped working and won't even open.

I click and click and absolutely nothing happens - can't even sign in. I'm on a Mac Laptop and unsure if it has to do with the Catalina update (even though it hadn't had any problems til now and I already had Catalina on my computer!). My internet connection is fine, did the Hextech repair thing and I uninstalled and reinstalled but still nothing!

What else is there that I can do or is this a problem not on my end?

Also, is this happening to anyone else?!?!