Click below link if you want to download the VDSmanager installation script:
http://download.ispsystem.com/install.sh
If you purchase a license for a concrete server, open SSH and run below commands one by one:
fetch "http://download.ispsystem.com/install.sh"
curl -o install.sh "http://download.ispsystem.com/install.sh"
wget "http://download.ispsystem.com/install.sh"
Execute the installation script
sh install.sh
Thanks!