Luckyelfs

While trying to login it tells me that my client is too old and i need to download the latest version. After i have downloaded the latest version my mac tells me that i can't open it because it's broken. I've tried all three downloaded versions and this message pops up every single time. Can someone please help me cuz I really wanna be able to play this game again. Right now i only have a 2015 mac laptop, i do not own a windows computer anymore.