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Thought it was odd. My hard-drive filled up during install, and instead of deleteing the files its self or at the very least writing over them or maybe even checking to see what was installed and what wasn't, it decided to install it all over again seperately.
Great, I sure hope the game isn't this buggy and unpolished!
Just not worth my time anymore.
Mine is 25GB as well.
But I think it grows to huge volumes during download and installation. So perhaps your client is still in that process, or it didn't remove the part it's suposed to remove.