The most recent stable release (1.3.12) can be downloaded <a href="http://enet.bespin.org/download/enet-1.3.12.tar.gz">here</a>.
The last release that is protocol compatible with the 1.2 series or earlier (1.2.5) can be downloaded <a href="http://enet.bespin.org/download/enet-1.2.5.tar.gz">here</a>
You can find the most recent ENet source at <a href="https://github.com/lsalzman/enet">the github repository</a>.
The <a href="http://lists.cubik.org/mailman/listinfo/enet-discuss">enet-discuss</a> list is for discussion of ENet, including bug reports or feature requests.