Missing schedules in the Traffic Control Centre typically indicate an installation/activation-related issue. Our first suggestion would be to uninstall FS Traffic, download a fresh copy from the store you purchased it from, and then run the freshly downloaded installer.
If, after a fresh install, you find that schedules are still missing, we would kindly recommend opening a ticket with Just Flight Support via the following link: https://www.justflight.com/support
In the ticket, we would recommend including information regarding any error messages you are seeing during installation/activation, and then our support team will be in the best position to assist with troubleshooting this.
Mark - Just Flight