Available here:
http://www.zoom.co.jp/downloads/h6/software/

What's New:
1. Supported XYH-5 (XY Stereo Mic).
2. Added MS Matrix function to input 1/2 and 3/4.
3. Added SOLO mode.
4. Added sound marker function on starting and stopping recording.
5. Added monitor function in menu of 'Lo Cut' and 'Comp/Limiter'.
6. Bug fix: 'Month' of Origination Date of BWF format is recorded one month late.

New Feature Documentation:
http://www.zoom.co.jp/download/H6_v2.00_Supplemental_Manual_EN.pdf