Despite some rumors to the contrary, Corel is back with Version 2.0 of their After Shot Pro software. Version 2 is now released and offered for $80 as a full version (new buyers) or for $60 for eligible Upgrade buyers. Details at the official Corel Online Store. Optionally in the shopping cart you can add a physical backup DVD for +$10. The shopping cart defaults a +$10 Extended Download service (if you don't want it, simply click the little "x" on the rightmost side of its row in the shopping cart). This is available for Linux, Windows and Mac.
If you are curious about this but don't want to commit to a purchase, Corel offers a 30 day fully functional free trial in the following operating systems (annotated screenshot crop below):