Superstar's HOTUD database entry is a bit of a mess at the moment.  In fact, the actual game isn't downloadable from there.
http://www.hotud.org/component/content/ … tegy/23887

However, all is not lost.  It looks like the "demo" version of the game is available at http://www.tucows.com/preview/292504 , and other iterations of the HOTUD database, such as http://www.goodolddays.net/hotud/index. … mp;id=4198 , state that "xcksu" can be used to register.  Archive.org even provides the latest DOS patch at http://web.archive.org/web/200412120854 … /games.htm .

What is tragically missing is SUPERWIN.ZIP , the Windows version of the game.  It doesn't seem to be at the above archive.org link, nor at alternative archived sites such as http://web.archive.org/web/200806241339 … -chain.tk/ .  It may be possible to contact Piotr Ostiak, the game's author, but without knowing Polish it's a bit difficult to navigate the sites where is name comes up.

Or maybe someone reading this happens to have this file and can supply it?