I've just had a look at the Download.com review page and that took me to the developer's web site at;
I see mention there of a 'coupon' if I am buying the software direct from their web site. Did you get a coupon when you installed this trialware?
If not, I would suggest you contact StorageCraft's Support.
At CNET 3 weeks ago I downloaded a 30-day trial of StorageCraft's ShadowProtect Desktop 4.0 where a price of $79.85 was advertised--normal price is $89.95. However, now after trying it out I want to buy it but I haven't figured out how to purchase it at the $79.95 price.