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This is a repost from page one.  In the library, you must click the running man + icon on the upper right hand corner as encircled in the image.  That will open a new window where you will navigate to your folder containing your unzipped runtime.  Notice the wording, ...navigate to your folder containing your unzipped runtime. 

Yes, you must unzip your renderosity purchases.

This has been done, but the problem came up to where the items were not listed as being within the folders once I clicked the running man + icon on the upper right hand corner. There were a lot of folders, but the content, the actual item came up empty.