Update to 4.8 Easily?

Hi, I'm an OLLLD old member of GamezAion.
I played this server THREE years ago, and i loved it. The community was nice and the rates were great.
I'm just now returning to playing aion.. And I struggled to download it, a lot.
So, i downloaded the game straight from a zipped file from megashare, via Just-Aion server's forum post. This game version is 4.7.5
I played that for a while, but let me tell you, I can not stand that server. The only reason I haven't played Gamez yet is because when I open the launcher to update it to 4.8, It acts as if the game is brand new and tries to download it from scratch. (i refuse to do this.. lol)
Is there a way for me to update my current game files from 4.7.5 to 4.8? I think they're EU game files.
I would really like to come back to Gamez, and play my old characters
I'm sorry if this is the wrong section, But it seemed the only one I could find for a question like this.

 

http://forum.gameznetwork.com/threa...y-for-modified-aion-install-locations.182503/

 

Thanks, I'll give that a try!
Currently doing the file check now. Hopefully it doesn't take too long