What operating system does your server run?
If you're using Fedora Linux
, you're in luck. Just run one of these commands:
sudo yum install drupal6
sudo yum install drupal7
If you're running Debian Linux
, you're also in luck. Just run the command:
sudo apt-get install drupal6
I'm sure every popular distro of Linux plus FreeBSD and Solaris have it available for easy installation.
If you're stuck with Windows, I'm sure there's a way, but I don't know it.