In the AllegroGraph Free Java Edition Start menu list, select Update AllegroGraph.
In the AllegroGraph installation directory there is an application called updater that you can run to download the latest patches. When you do, the output of the program will look something like this:
peep% ./updater
;; Connecting to http://www.franz.com/ftp/pub/patches/.
;; Reading CRC cache...done.
;; Checking for new update.fasl.
;; Retrieving list of available patches.
;; Checking which patches need to be downloaded.
downloading: update/agraph/3.0/DESCRIPTIONS
downloading: update/agraph/3.0/pfo013.001 (compressed)
;; Creating CRC cache (please wait)...done.
***** NOTE: You must restart the AllegroGraph server for the newly
downloaded updates to be installed.
peep%
In the above case, the line of interest is the one that references update/agraph/3.0/pfo013.001.
Remember to restart your server after running the updater. Updates are loaded at server start time only.