Re: KO BJ Software
Why do you say it is invalid? Maybe the server was offline as servers are inclined to do when you need them.
Anyway, the author's name is Dave Burdick. He runs www.burdicksoft.com. You can select KO or his own Burdicksoft bj from this site. If you select KO you go back to www.koblackjack.com where you click on KO training camp game, then click "download link to KO backjack" (not the demo link) and shazam your at Kagi where you can drop your CC number & order KO.
I got it recently and 1,2,4,6 and 8 decks are shown as game options. Its easy to set up and use. As per correspondence with the author, I've seen other comments that the author has been unresponsive. My own experience is two emails sent at various times - one email replied to.
If you want it to work without the setup quirks of other general purpose, then get it and you can get down to practicing. The drills are ok, flash cards you can add to & card counting values. If you place emphasis on its ability to do sims, well, the sim sand data export are pretty rudimentary so you'll want to get something else.