Can't get Key Code to Work

For some reason I can't get Directory Opus to accept the Key Code I received when I purchased the product through Humble Bundle. I am copying and pasting directly from my Humble Bundle Library and I have not previously registered the product. I would appreciate any help.

Humble Bundle keys were valid for six months after the bundle was sold (November 2016) and expired in May 2017 if not registered before that time. (If registered, they last forever.)

:confused: I see.