[CLIENT], [CRASH] on Mac since the new patch 4.18. (Yosemite)

Dear Riot, I've been playing LoL since 2 years now on mac.. I've been looking into the forum to answer my problem with the client but it seems that no one is being answered and it's a problem. Im now on OSX Yosemite

First of all everything start (for me) two weeks ago. I was playing a normal 5v5 PvP game. Everything was going fine and the game just freezed and the "Bugsplat" appeared. So I reconnected and I ended the game. After that I played a lot of game with the "Bugsplat" problem and more I played more the "Bugsplat" started to appear... Then, yesterday night, I was playing with my Friends and the "Bugsplat" just didn't stopped appearing. I reconnected like seven times since I decided to repair my client...

SO I started repairing my client and every time I did the repairing the "Bugsplat" transformed himself into an other bug : "LoL patcher quit unexpectedly". I was being patient and try to repaired it for five several time... Nothing happenned just this new bug. Then I decided (After looking a several time into the forums) to uninstall and reinstall the game.

Now I can't even installed it... The client freeze at 33% or 87% After 3 hours the client was always loading with a 0KBps speed. I really want to play. I post a screen shot of my mac (Its in fench sorry for that im french, and sorry if my english isn't good to I tried to communicate with you with the best english I can spell). :P

Plz fix this Mac user are tired of this problem thank you !!!!! I hope it will bi fixed so I can go back on the rift !!!