Indigo v0.9 is available in both 32 bit and 64 bit builds for Windows.
Significant new features in 0.9 include:
- Textured emitters
- Exit Portals
- Atmospheric simulation
- Console-mode executable and new 64-bit build.
- Improved glossy transparent material.
- Bug fixes and big performance increases.
You can download it from the Indigo website. There is an updated Blendigo (the official Blender to Indigo exporter) version available as well.