I contacted them and they explained that they have a lifetime re-download policy and how to access those files.
Well something happened to the download in their system. It showed the purchase but the download was not listed.
They promptly issued a special code so I could download (and reestablish in their system) the same add-on for no charge.
I initially contacted them late afternoon and received a reply within a few hours. Later that night I discovered the download problem and contacted them again.
I received a reply first thing in the morning with a solution to my problem. So overall time from start to finish was about a day to get everything settled.
I rate a company by its customer service. They get a A+, Five Star rating in my book. Not only are their products top notch, they provided prompt courteous service with genuine interest in the customers problem.
Salute!
