If you want to use both, first install the older version and then the newer one. They happily coexist. If you only want to use the latset version, first uninstall the older version and then install the newer one.
I always thought an upgrade would supercede the earlier version. I guess I'm thinking that an upgrade is an update only.
> I always thought an upgrade would supercede the earlier version.
Nope. An upgrade is nothing more than a price break on the new full version. It's still a separate, full piece of software. Harm is correct.