This Indigo 2.0 Patch DMG fixes a compatibility problem with Indigo 2.0 and Leopard (OS 10.5). The compatibility conflict resulted in Indigo's built-in web server failing to launch correctly.
Note this is not a complete download of Indigo 2.0, but is a patch to be applied after installing Indigo. The patch also works with the public beta of Indigo 3.0. The next release of the 3.0 public beta will have the patched files included.
Lastly, the patch also provides a web server performance increase for Intel Mac users, even those running OS 10.4.