I have Nico Frans Aqualand for Windows XP, but I have a Windows Vista computer. Where can I find an upgrade for the application?
You can't upgrade the application because there isn't an online resource available for this purpose. The only way to obtain more information about it, is to contact the developer. From what it seems, the application looks like it's discontinued. However, in order to run the application on your computer, you can try Windows Vista Compatibility Mode.