Somehow it was uninstalled. Weird.
There was also a bug in the code. Maybe a node.js version issue.
Unable to Install Plugins
here is the error message I receive when trying to install plugins from the /admin site. The forum is running on an EC2 in AWS.
Did you forget the error message? Check permissions in the filesystem
Looks like you do not have write access to the volume your NodeBB is installed in.