For anyone else following this, it was an Upgrade Key Code in question. This means that there needs to be an installed version of the Aquarium on that computer in order for the Key to work. In theory, the program should be able to be installed on the new computer using the original Key, then the Upgrade Key would bring it up to date. In practicality, I've never actually tried this, so I'm having Prolific issue a new Key to Tadam.
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