So for anyone who is stuck @ 81%. Check your patch_lib log file. Do a search for the word error. If you are missing 44_web_0.jpg Here is your fix.
It will need to be renamed to 44_web_0 and put in C:\Program Files\Riot Games\League of Legends\Air\assets\storeImages\content\champion_po rtraits\
http://img197.imageshack.us/img197/4797/44web0.jpg
NOTE: THIS WILL ONLY WORK IF THIS IS THE EXACT FILE YOU ARE MISSING. Check your patch_lib log file as stated in the initial sentence. If you are missing a different .jpg file POST IT HERE and I will try to upload your file if I have it 
EDIT #1: For those missing the GemKnight_Splash_0.jpg file the link can be found here
http://img192.imageshack.us/img192/5...ghtsplash0.jpg
EDIT #2: For those getting [ERROR] Unable to verify source for expansion [C:\Riot Games\League of Legends\Game\DATA\Sounds\FMOD\VOBank_en_US.fsb]
Please download this file : http://www.megaupload.com/?d=FSGLK38A And place it where it needs to go. (in the FMOD folder)
EDIT #3 : For those that need the HeroPak_client.zip file from this error [ERROR] Unable to verify source for expansion [C:\Riot Games\League of Legends\Game\HeroPak_client.zip]
Please download this file: http://76.73.13.30/Files/League%20of...Pak_client.zip
League of Legends Community
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