When you are finished downloading, extract the files to a new folder.
Open up an new Window and go to you LoL Installation Folder
(for me it is C:\Riot Games\League of Legends).
In the LoL Folder you go to RADS\projects\lol_air_client\releases\0.0.0.75\dep loy
There you need to do a backup of following files:
Make a BackUp and put copies of these two files in the BackUp Folder .
If you created copies of both files/folder, you need to go in to the assets folder and there in the swfs folder.
Delete the file "AirGeneratedContent.swf" in
the swfs Folder and replace it with the "AirGeneratedContent.swf" from the .rar file!
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Now go back to the deploy Folder and delete
and replace the "LolClient.swf" with either the "6v6.swf" or the "dominion.swf"
Rename the "6v6.swf" or the "dominion.swf" to "LolClient" and put it in the deploy Folder!
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Make sure to NOT change the name to "xxxx.SWF"! The game can't recognize the file then.
The game might come up with an error! This does not effect the matchmaking/Lobby creating AT ALL!