Hey there, mozaki.
I said this in a previous thread so hopefully it'll work for you too as it's a similar issue
It sounds like your download isn't completing entirely and that's causing the installer to error out. As this is the case, you might want to try getting a download manager. Here's one I know of that's fairly popular:
http://www.speedbit.com/. If your internet disconnects for any reason during the download, you can resume it via the download manager. This should help get the download to 100% and let you install the game.
Good luck and let me know how it goes!
EDIT: Make sure you're downloading the client from here:
http://www.cabal.com/DownLoad/Client
~ [GM] Kato
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