You have two options:

a) Re-download the trial installer. This is the more extreme option but if you're having some difficulty with your current install we definitely recommend this. We recommend uninstalling what you have before reinstalling. If you're a full version user you will automatically be re-upgraded to the full version when it installs. Dream Aquarium will remember your tank setups so you won't lose your settings. To get the latest installer click here.

b) Do an update using our updater
ON WINDOWS: Click on your Window START button and choose "All Programs" -> "Dream Aquarium" -> "Check for Updates"

ON MAC: Open your Sytem Preference and choose Desktop & Screen Saver. With Dream Aquarium selected, press the Settings (or Options) button and then "Check for Updates"