That wallet is good and has been approved as the new "Official Wallet." It has the most up to date binaries in it and can replace your current link.
This is one thing I haven't tried yet, how would you ensure that your current wallet and all the addresses make it to the new software?
You don't need to do anything but install the wallet. It does not install anything to %appdata% which is where your wallet lives, only to Program Files, so you can safely install and run this client even if you have an older one already installed.