"needs to patch"

So Im playing on a MAC. I FINALLY got the game to actually launch. Once I log in, I get stuck at the "downloading" screen, as if its updating. It stays there at 0% for a handful of minutes, then prompts me to restart, with a message telling me i need to download a patch. As far as I can tell, I'm using 3.3.5a. Ive not had much luck with the other threads I've read, so i was hoping maybe someone could address this specifically with me. Many thanks in advance for taking the time to help.

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