Hi Pegleg, and welcome to Laptop GPS World. As Ken says, it used to be possible to copy the content of the data folder from a newer Streets & Trips version to the data folder of an older version. I haven't had the need myself to try this with the new S&T 2009, as for my needs the 2009 version is the best, but I heard of some people who did do it. I remember one user saying that the 2009 version needs to be activated for this to work. I haven't tested this, but it does make sense, because otherwise anyone could just use the data from the free downloaded trial version in their old software indefinitely.
Streets and Trips 2009 can no longer export maps to Pocket Streets. I think S&T 2008 was the last version capable of it.