As of the end of 2010, the latest general availability release of GemStone 64 Bit is (go here for documentation). Unfortunately, because of changes in the Macintosh build machines from Leopard to Snow Leopard, there was not a Macintosh release of I’ve created a “private build” using the same sources, and you can get the equivalent product here. If you use these instructions, you can substitute the new download of for the FTP instructions on getting 2.4.4.