On system hypatia, the new versions have completely replaced the older versions. The new versions will replace older versions on alberti, hopper and christa on Monday 25 October. At that time, Version 4.10 will be available as pine.old, pico.old and pilot.old. Pico, a stand-alone file editor, is also used as the default composer for email within pine. Version 4.20 is an interim release that introduces new functionality and fixes numerous bugs.
Full details are available in the Release Notes and help internal to pine.
If you have access to an LDAP server, it can now be used from pine.