Why does it need an internet connection?
The installer is merely a stripped-down, single-file build of MacRelix with just enough tools to run the installer script, including `upgrade`.
I didn’t feel like setting up open WiFi or WEP WiFi (same thing amirite) for my PowerBook so to install it I had my ThinkPad running internet connection sharing, connected through two patch cables and an old PowerConnect switch since I couldn’t find a crossover cable.