I purchased the 3 pack after installing and testing the stand-alone single page option. This option worked fine which is why I went ahead and purchased the additional modules. Upon installing the modules I received the error "Download, install, and activate the basic plug-in before..." which is exactly what I did (note I tested it first before purchase). I get this installation error on all three plug-ins. I've deactivated and uninstalled everything, then re-installed. Still no-go. If I deactivate the plug-ins the Single Post plugin starts to work again, but as soon as one of the others are activated, it fails.