How do I update Fusion?

I don't see it in the options, I might have missed it though. It's also not in the user manual from what I can tell. Thanks!

update from what version?
afaik you can only download the latest version from BMD and the install it. this will remove the older version and replace it with the new one. all your settings and preference will be there (as long as they are compatible with the old system)