Same story here. I contacted support however NCH charge an additional fee for support (platinum support = telephone) so I do not expect an email answer, if I do receive any then i will post again here.
EDIT:
http://nch.invisionzone.com/index.php?/topic/12011-soundtap-mac-version-wont-install-driver/
link for PC: http://www.nch.com.au/soundtap/kb/1364.html
link for Mac: No, none of the above questions apply : leads directly to the email form I already filled.