Built with beta version of Unity. Will only work on your computer!

Where could I possibly download the non beta version of unity? Is it possible to preform an upgrade (so that my web based build will work on multiple machines) without having to reimport (drag and drop) ALL of my assets?

http://unity3d.com/unity/download/

If you open your project in the new Unity, it will automatically "upgrade" the entire project to the latest version, so you won't have to worry about having to manually import anything.