If you are seeing “mgmedia2 component not installed. Please install first to use the plugin.” then you probably either
- just tried to uninstall the mgmedia2 thing from your Joomla admin panel, or
- are trying to install mgmedia2.
If you want to uninstal mgmedia2, make sure you go to Installers > Mambots and uninstall the mambot/plugin as well.
If you want to install mgmedia2, you missed a step and you still need to installed the component in Installers > Components. See readme.
I just wanted to put this out there in case anyone is struggling with it.