I saw the comment in your plugin that if one also uses WPMUDev's Pro Site they can incorporate charging for certain plugins. I did purchase that plugin but now, in addition to their annoying "Easily update by installing..." message everywhere, I get the following:
WARNING: Multisite Plugin Manager and the Premium Plugins module are incompatible. Please remove Multisite Plugin Manager.
So, I'm now under the impression I should deactivate, and I suppose delete, your plugin. Is this correct?