There are a number of bug fixes but the two major changes to this release;
There is no additional purchase required for this update for current Sharpen owners. Current owners can simply visit Topaz and download the update from there.
Sharpen AI will be available for $59.99 USD (regularly $79.99) from today Thursday, July 23 through Friday, August 7. The Utility Bundle, which includes JPEG to RAW AI, DeNoise AI, Sharpen AI, and Gigapixel AI, is also on sale for the same period of time and is discounted to $195.99 USD (regularly $249.99). Is you use the code TRAVISHALE20 at checkout you may also get a further discount.