What appears to be the standard setup is that there is HeroLab.exe and HeroLab64.exe in the same folder (along with HLExport.exe and unins000.exe).
The file property details on HeroLab64.exe show a File Version of 8.9.0.868
The file property details on HeroLab.exe show a File Version of 8.8.9.869
The version for the 64-bit matches the filename of the download available in this thread at #2,
http://forums.wolflair.com/showpost....10&postcount=2