Upgrading to Alpha Client

So I was just approved for the Alpha client and I have a single question that, after some searching, I couldn't get answered. Do I have to uninstall anything (Like, the game file) in order to download the client, or will I just have two separate clients that both run the game?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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