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The canonical link to http://www.tracker-software.com/PDFX3SA_sm.zip downloads an installer version stamped as v220.127.116.11, while the latest v3.x I've seen mentioned is v18.104.22.168. Just happened to notice it while toying with an old VM, and pretty sure it's a moot point, yet I can't find that .001 difference documented anywhere - is it of any relevance?
Yes this is most likely a moot point! The last V3 build is from 1 Jan 2009, and this build 131 was most likely to introduce support for V4 keys. In any case we do not keep any documentation or build history for V3 now I am afraid so I can't provide any further info on this mystery.