If you already have HEED running, you can install this new version in the same folder, and all your data will be preserved. Just hit Recalculate Old Projects to update each scheme.
HEED is free.
A Beta version of HEED for the MS Surface Pro Tablet can be downloaded here:
HEED Workshop Slides 2010 (6 MB. PDF file)
HEED Summary Validation Report 2012 (1.6 MB. PDF file)
Download: HEED User Survey: March 2002
Download: HEED User Survey: May 2006
Our full set of Energy Design Tools and Technical Bibliography is available on: http://www.energy-design-tools.aud.ucla.edu