Switching from starter to trial?

I've been using Studio Starter for about two months. I'd now like to use the trial version of the full edition for 30 days, to see if I want to upgrade.

I uninstalled Studio Starter because I read on the trial page that it won't work if you already have an edition of Studio installed. Once that was done, I ran the installer for the trial of the full version, but when I opened it up, it was still the starter version.

What can I do?