This plugin appears to be abandoned by its creators.
Unlike two other group deal buying plugins, WPdeals, at least, installed without crashing my WP installation. For that it get Two stars! But, all of my deals that I've posed show either sold out or Deals expired. I've followed the instruction in the support, to no avail.
I've had to HIRE AND PAY for a developer to fix this. It's still cheaper than solution than most.