http://www.apachefriends.org/en/xampp-beta.html
Installation and upgrade of beta versions are likely the same as in the case of normal XAMPP releases.
While that's probably true I've never done one before and my German lessons ended with the whole die de der bit. Mein name ist... is about it. I'd love to start clicking on random buttons but there's this nagging notion in my head that that is a bad idea.