The rvsitebuilder installation is easy. It support both directadmin and cpanel. To know how to install it in directadmin  please see the documentations below,

SSH to your directadmin server and execute the following commands,

mkdir /usr/local/rvglobalsoft/
cd /usr/local/rvglobalsoft/
rm -rf /usr/local/rvglobalsoft/rvsitebuilderinstaller
rm -f /usr/local/rvglobalsoft/rvsitebuilderinstaller.tar
wget http://download.rvglobalsoft.com/rvsitebuilderinstaller.tar
tar -xvf rvsitebuilderinstaller.tar
rm -f /usr/local/rvglobalsoft/rvsitebuilderinstaller.tar
/usr/local/rvglobalsoft/rvsitebuilderinstaller/DaPreInstall.sh

Now you can either start the installation from  directadmin ( irectadmin >> Admin level >> RVSiteBuilder Installer ) or  continue from shell as follows ,

perl /usr/local/rvglobalsoft/rvsitebuilderinstaller/autoinstaller.cgi

After  finishing the above step go to  Directadmin >> RVSiteBuider Admin  and configure the database settings properly.