Uninstall WHMCS
From WHMCS Documentation
There are times when a user has the need to remove WHMCS from their system.
This can be achieved by following 4 small steps:
- Take a backup of the database and configuration.php file. You may need these at a later date should you want to start using WHMCS again.
- Remove all the related files and folders of WHMCS from your server.
- Remove the database tables relating to your WHMCS information.
- Ensure all Cron Jobs have been cancelled.