Right-click the file and change the file extension by .

Once you have the code, entering it is not obvious. There is no "Register" button on the main screensaver preview window. You must use the hidden .

The official software is developed by SereneScreen. In recent years, the official website has occasionally offered the software for free or transitioned to a simpler licensing model. If you are being asked to pay for a "Key Code" on a third-party site in 2024, you may be getting scammed.

Unauthorized keys are regularly blacklisted by developers, disabling your software updates and blocking access to customer service.

Furthermore, using pirated keys violates the software's end-user license agreement and deprives indie developers of the resources needed to maintain the software and ensure compatibility with modern operating systems like Windows 11. Purchasing a legitimate key ensures you receive safe, uncorrupted software files alongside access to future updates and official technical support.

Launch the Marine Aquarium 3 screensaver. Right-click anywhere on the screen while it is running, or open your Windows Screen Saver settings and click Settings .

Most modern versions of the software verify the key against an online database; blacklisted keys will result in the program reverting to trial mode.

Click on the glass to interact with the fish.

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