I saw this posted a month or so ago:

The game runs surprisingly well. You can download the DRM-free version of the game from BioMedia Project. The files are hosted with the permission of the LEGO Group. The only fix I did was enabling widescreen support with modern screen resolutions. The instructions for that are here.

I never played any of the Bionicle games but I have very fond memories of the Lego! As well as a (what I assume to be Windows) ISO, you can also play it on Xbox 360, PlayStation 2, GameCube, Wii, DS, GameBoy Advance, and even “Java (Phone)”.