try going here: https://code.google.com/p/opensim4opencog/source/browse/trunk/lib/NLPLibs.net/LAIR.ResourceAPIs.WordNet.dll?r=1327
find "View Raw File" and RIGHT click it, and download it.
then try this one
for the collections.
However, I think you must have missed some kind of installation step. The actual .dll's should be here though. (look through the dropdown).