Im testing this ATM... but hopefully it works. But this is what I did. I went to change region then picked a random language that isnt English. Yes I know theres 2 english but dont pick them. Pick a language that you have never chosen before. It should then update...
Hope this helps! Im still updating. I will post results when I finish!
And feel free to post your results so people could see if it actually works!
Edit: When you finish repatching dont forget to change back to English!
Edit 11:52PM : Seems like this method didnt work. Sorry guys! Lets hope repair works!
Edit 12:03 AM (WORKING) :
1) Go to this folder in your PBE directory: LOLPBE\RADS\projects\lol_air_client\releases\0.0.0 .142\
2) Delete releasemanifest and S_OK
3) Go into the deploy folder in that same directory
4) In there, delete the lib, logs, META-INF, and mod folders
5) Also delete LolClient.exe, LolClient.swf, and locale.properties
6) Repatch THEN PLAY!!
I copied this off someone! I did not make this!