One of the priorities of the APM team is to continue to find new ways to make it easier to use. The Mission Planner is a big part of that, with it's one-click firmware loading, but author Michael Oborne has now done it again with a great installation utility (64-bit Windows here, 32-bit here) that not only installs the Mission Planner, but also detects which APM you have and installs the right driver for it. That's like five manual steps eliminated!
Great work, Michael!
(As always, it will also check for updates at startup and download the latest version)