I have figured out a way to get this Smooth Restarter working on our server by doing these three things:

1)  Set Smooth Restarter to the desired server restart times (e.g., Noon & Midnight).
2)  Comment out the code in Smooth Restarter that commands the server to shutdown/restart.
3)  Use your webhost's Scheduled actions to create server restarts at the times set in step #1 (e.g., Noon & Midnight).

So basically all Smooth Restarter does now is KICK all players right before the webhost fires it's Scheduled action to restart the server.

At this point I'd request the developer update the plugin adding settings to KickAllPlayers = true and RestartServer = False giving the appearance of Smooth Restarter actually restarting your server. ;)