We had a little link bug in our 2.2 final plugins for Mac. They linked to libcrypto 0.9.8, a library that ships with Snow Leopard, but not with older versions of Mac OS X. That has been fixed and now it links to version 0.9.7 which is present on Mac OS X 10.4, 10.5 and 10.6. Sorry for the inconvenience.
Please download the newer archive.