When I bought Topaz a couple years ago, you got "free" updates for a year. After that it was $99 per year for Photo AI. I haven't updated after the first year. I have issues with tiling on many of my photos. There seemed to be no fix available at the time. I would gladly pay an upgrade fee, if I knew they had the problem fixed, but would hate to pay for upgrade and have the same issue. As I understand, most folks don't have this issue, although it's a known problem, and Topaz couldn't tell why I had it. The stand alone products didn't seem to suffer from this. Since the standalone products aren't updated, they won't process my Z8 RAW files. I have to edit in LR and then use Denoise and/or Sharpen. It works, but is clumsy.
I really like Topaz, and wouldn't want to be without, but I would like to be able to consistently use the Photo AI, as it's one and done.