directadmin lets

nano /usr/local/directadmin/scripts/letsencrypt.sh

Replace Line 31

Code: 
LICENSE="https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"

With

Code: 
LICENSE="https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf"