Astrogeddon 1.62 is the latest version. See the history page for a list of all the changes.
Which version do I have?
Your current version number is displayed below the main menu when you start the program (version numbers are often followed by 'd' to indicate 'demo' or 'f' to indicate 'full version').
How do I upgrade?
Simply uninstall your current copy, then download and install the new version. Note that upgrading will clear your high-score table.