The latest version of Indigo (1.8.3) is now posted for download:

http://www.perceptiveautomation.com/indigo/download.html

This version adds support for INSTEON modules: KeypadLinc Relay, OutletLinc, SocketLinc Dimmer, 2-Wire Companion Switch, and EZSwitch30.

Indigo 3.0 (and 2.0) customers already have support for these INSTEON modules and should not download version 1.8.