I did get RokSprocket to install once I downloaded the new version 2.1.3. It also installed RokCommon and RokInjectModule. Thanks!
When I tried Cerulean, it still produced a blank screen but then I went to Extensions-Discover and Cerulean was listed. After discovering, it shows in the Template Manager as 'files_Joomla - Default.' If I click on it, the styles don't show, just '500-error loading file.' When I try to load its files in the Template Manager, it shows the screen cap below.
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