This may be my school's internet,* but the link http://fasttravel-game.com/gaemz/superhotlinemiamidoc/DOCUMENTATION.html is broken -- chrome says:

This site can't be reached

fasttravel-game.com's server DNS address could not be found.

ERR_NAME_NOT_RESOLVED

*Just tried it on my home internet. no dice.

Yeah, that's my old website that no longer exists, so the link is dead.

There's a folder inside the downloadable versions containing the documentation (Editor/Documentation). I'll add it to the download list on the game's page.