I’m running Release Candidate 1.
Following Felice’s advice to try http://lov.okfn.org/dataset/lov/vocabs I was able to import schema.org in .n3 format and it loaded very quickly. I didn’t think to try editing the n3 files but will look into that. When I was testing a couple of other vocabularies (e.g. CreativeWork, Getty Vocabulary Program) the .n3 files would timeout during the import and fail.
However, I was able to import these vocabularies after I opened the .n3 files in the Protege ontology editor and saved as RDF/XML.
Just starting to dip my toe into understanding how to work with Vocabularies, RDF, etc., and easy to miss some of the more obvious points.
Thanks, again, for your help.