cd /usr/local/directadmin
wget -O update.tar.gz https://www.directadmin.com/cgi-bin/daupdate?uid=123\&lid=1234
tar xvzf update.tar.gz
./directadmin p
cd scripts
./update.sh
service directadmin restart
head -n 1 update.tar.gz
to search for an error. If there is an readble error inside the file, then you'll need to contact sales@directadmin.com to get your license activated or updated.