Hi, I don’t know if you are still interested.
I’ll answer you anyway, though.
The license key should be entered here:
/usr/local/CyberCP/public/mailwatch/mailscanner/conf.php
at line 55 (for me) (decomment the line!):
define('MAXMIND_LICENSE_KEY', 'mylicensekey');
After that you have to change the permissions to the folder, Setting them to 777:
/usr/local/CyberCP/public/mailwatch/mailscanner/temp
Then from the MailScanner interface - > Tools & Links → Update GeoIP Database.
Then reset the permissions of the folder from before to 755.
Finish.