Currently Dream Aquarium will only run on macs with OS version 10.6 or higher.
If you are a registered user and are having trouble updating to the full version, the most common cause is that the screensaver has not been installed correctly.
The Package icon seen in the installer must be dragged-and-dropped onto the blue folder to the right of it.
Mac OS will then ask you to authenticate the install.
You will likely need to enter your password in order to authenticate.
This is because Dream Aquarium must reside in your "/Library/Screen Savers" directory to be able to update/activate properly.
Then click the "OPEN" button beneath the package.
If you just have a question or are not experiencing the problems described above, please contact us here.