The update file was provided for (1) sites which want source code and (2)
sites which do not use the LISTSERV version of CARD (see the 1.6d release
notes for more information). If you don't care about source code, you
should install the object code fix. In this particular case you should
wait until I release the version that works with SFS, as it will obsolete
17A-004o. I am waiting for a CMS6 site to check that it works under CMS6
before doing so.
Eric