Topaz Sharpen not updating Preview after 3.1.1 update

I just loaded the new 3.3.1 update for Sharpen on my Macbook Pro mid-2015 running under the latest Big Sur. The Preview pane is no longer updating. It appears to start the updating process, but the progress bar goes most of the way, turns red, and says “Not Updated”. I started with auto-preview on and switched to manual, but the behavior did not change.