First, check UID (user ID) and LID (License ID)
cat /usr/local/directadmin/scripts/setup.txt
ip=103.3.173.13
netmask=
uid=4115
lid=181822
Edit crontab
crontab -e
Add in the last line
0 6,18 * * * root /usr/local/directadmin/scripts/getLicense.sh 4115 181822; echo"action=directadmin&value=restart" >> /usr/local/directadmin/data/task.queue > /dev/null 2>&1
service crond restart