The downloadable version needs an installer because about 50% of our customer service complaints are from people who can't figure out how to install it. The WinZip self-extractor that I have always used defaults to putting the file in C:\Windows\Desktop, which makes the file visible on the desktop in Win9x, but not in Win2000 or XP. So we get an email from every user of Win2000/XP asking where the file went.
Also, if the user wants to use the Aquarium as a screensaver, they must copy the file to their system directory and use Display Properties to set it as the current screensaver (or right-click the fish icon, and hit Install).
The installer does all these things automatically, and also provides an "uninstall" script.
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