Rebuilder makes no permanent changes to your *LEGO Island* installation and none of its patches require administrator privileges (it can also patch the parts of *LEGO Island* that require administrator privileges).
Running Rebuilder will open a GUI you can use to select which patches you'd like to run the game with.
To use the music insertion functions, open the Music tab to display a list of the music files in the game. You can then pick and choose which ones you'd like to replace.
The Run button will launch the game with the current settings. The Kill button will close all currently running instances of the game.
Rebuilder also supports command line args:
*`-r`/`--run`: Runs LEGO Island with the currently saved configuration, bypassing Rebuilder's GUI.