There should not be anything at that location. That’s a completely invalid location for any artifact related to this plugin.
Are you sure you’re looking for the JAR files in the correct location? There will absolutely be a POM file in specific locations that has no accompanying JAR files. Screenshots of the details that are leading you to make this conclusion might be helpful to verify what’s working as expected or not.
Setting this up should generally take less than 5 minutes. There’s either something odd specific to your environment or a details that aren’t really being captured in the discussion. Remember that Nexus is serving as a caching proxy. If you’re rapidly changing many things, but not considering what the cache state may be, you might be jumping past working configurations before you truly see the result of those changes.