It's the same TWS program, but in general will be at a slightly different version level than any particular copy that you download. This can work in your favor too, because they can quickly switch the version level for all users accessing it from the web if they need to, to address an urgent problem. They are probably fully able to manage which is the best version than the user is, for most users. Those who do want to manage the version level themselves can choose the newest or an older version by downloading manually from http://www.interactivebrokers.com/en/index.php?f=674