I disabled Notification Center a while ago by running
launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
But after enabling it back with
launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
it didn't reappear in the Finder.
When navigating to
/System/Library/CoreServices in Finder I see two NotificationCenter icons (with sizes 3.9 MB and 3.3MB). Running the bigger one will start NC until the next reboot, running the smaller one does nothing.
How can I get Notification Center back?