oh... yeah, it doesn't work for the 5 pack, only the single and not if I'm upgrading..
The coupon would not normally work for an upgrade as it's already discounted.
That said, I was able to see it not working for the 5-pack. I have placed a ticket to have it looked at.
Internal ref: ODNT-7431
Thanks for the report.
Sean Drohan
Stardock Product Lifecycle Manager