As of this moment, we don't offer Installatron for DirectAdmin by default.
You can, however, install this after you have created a VM with the CentOS DirectAdmin image. Installatron can be added to the installation using a script or the DirectAdmin plugin, more information regarding this can be found on the following page: http://installatron.com/plugin/download/directadmin
The installation is relatively easy and should be fairly quick to setup.
Please note that Tilaa does not provide or sell any licenses for Installatron so you would need to arrange that yourself, furthermore we can't provide any support on Installatron.
The steps to perform are:
wget https://data.installatron.com/installatron-plugin.sh chmod +x installatron-plugin.sh ./installatron-plugin.sh -f
For troubleshooting please go to http://installatron.com/docs/admin/troubleshooting