Changing the LoL Icon

I'm posting this both in Misc and GD, so if a mod decides it doesn't fit in one please feel free to remove it, anyway, I need a bit of help. League didn't want to install this most recent patch so I uninstalled and re installed it. (Second time but I don't care. League is fun enough). However, this time the league icon isn't there in the windows for the launcher. It's just this picture. I was wondering if it was possible to replace it with the splash art of firecracker jinx, or even just anything else in general. (I only say FC jinx because it is the first thing I bought RP for and really got excited for it....((sorry for the slight passive pun (((......no I'm not))). I looked up online, but the options they said just wouldn't work some reason.

When I did the normal right click -> properties -> change icon, it said this, and I quote exactly "Windows can't find the file %SystemRoot%\Installer{79BF264901-1EC4-4726-B3C2-A7859706C6E7}\APPDIRlol.launcher.exe." and brings up a bunch of stock icons. Any help?