Hi,
I've uploaded a new version of WormNAT2 a few weeks ago. This version doesn't need wkPackets.dll or borlndmm.dll. It should also fix the "skipped packet" bug, which could cause random disconnects.
wkWormNAT2Ex is a version of WormNAT2 included with some snoopers. This version has some additional interoperability needed to host games from snoopers, but this functionality is already integrated in the main version. Using the old version of WormNAT2 should be avoided whenever possible, as it causes random disconnects as mentioned above.