Please review Limits for self-promotion in answers; I think your answer leaned too far to the lack-of-disclosure side.
Your answer was one of two answers ever made by you, both of which link to the same product. It does look a little too much like promotion of that product is your sole purpose on SO. I am not saying that is the case, but we'd need to see more answers from you on different subjects.
The other answer linked to an Open Source product, from a user that has also posted on other subjects. His answer also did not include information on a free 14-day trial, making your answer look quite commercial.
Linking to commercial products is a fine line to walk. If you are associated with the company that sells the product you link to, you need to disclose that ("our company makes a product called Frobnar, which you should look at"). If you are not associated, stating that explicitly also helps ("BTW, I don't work at Acme, but their Frobnar product solved this problem for me in the past").