That came out a few weeks while ago. It was buggy and there were some reports of crashing which was fixed in the latest version. You must've missed the threads where people were whining about it.
Supposedly version 823 crashes and 824 is fixed but you can only get 824 in browser based version, not stand alone?
Just tried using BookTrader awhile ago and it crashed and burned about 4x in an hour. It seems to be unstable. Needs a lot of work... This was with version 823.2, the notorious one for crashing...
version 824 which has been released to browser users fixes this problem. I've been running a beta of the new release on stand alone for two weeks w/o a crash. I suspect it will be made available for the general public via stand alone within a few days.