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Hi! Sounds like there may be an issue with the file since both methods should work.

Have you tried searching Graffletopia from within OmniGraffle? Click the magnifying glass next to the search field in the Stencils window and switch the search to Graffletopia. Then see if you can install any of the search results.

If you're still running into issues, send us an email with one of the troublesome stencils attached: