I have an issue that I cannot even open the client on my mid 2009 MBP but everything is fine with my 2010 iMac. The difference between how I install the new os is just only updated the os on my iMac but I did a clean reinstall on my MBP. After I finished the installation I can smoothly run games on my iMac but after I downloaded and open the client on my OS reinstalled MBP, it just keep crashing and pops out a window which said, "LoL Patcher quit unexpectedly." I almost tried everything, I tried reinstall the os again, changing permissions and stuff and even copied the whole game file from my iMac (which runs perfectly). Yet all the method I tried were failed.
I am so desperate now because sadly my iMac is an office computer which I cannot always play with and my ranked team cannot play with me anymore because my failed MBP and will definitely lose a chance to win the ward skin price.
I've been searching on the web about the issue that I've been encountering and I found my issue is so rare that no one just keep crashing on the patcher and at least they can start the game. But of cause no one deserves to have such problem as I do but I do hope riot would notice this and address the issue and find a solution.
And if someone is having the same issue as I have, you are not alone.
And sorry for my bad english. I am not a native english speaker.