CM Tooltip (CMTG) - Troubleshooting - Removing Admin Notices
Removing The Admin Notices
If your license has expired and you didn't decide to renew it, you may find yourself stuck with the notices which sometimes are not dismissable (mostly in older versions).
To support those cases we came up with a code which should hide the notices. Added the following code to the functions.php of the theme. Always create a back up before editing theme files.