Hmm, that's interesting. The Nook 4 Tablets app was recently updated to allow magazine downloading for all my subscriptions; I wonder if the magazine publisher you're using didn't give B&N the go-ahead to do that. (The onus is on the publisher to allow B&N to allow the magazine to work with the nook apps.)
Which magazine is it, if you don't mind telling us? Those of us with tablets could get the free first issue and check it out -- see if we can replicate the error.
Anyway, to answer your question, you can't sideload the magazines via the Nook 4 PC software.
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