The Application Vault for Plesk via your dedicated hosting account can be a useful tool to have at your fingertips.  Think of it like Fantastico is for cPanel, for those more familiar with that interface and control panel selection.

Application Vault allows you to easily auto-install selected third party scripts into your web site.  To access, login to Plesk, and then go to the Application Vault icon.  Click that and then click on the icon to "Add New Application".  That should be located under "Tools".  There is also a "Site Application" section on this screen which is where your installed apps will live after being added to your dedicated hosting plan.

Next you will be taken to a screen with all the site application packages that are available for you.  You can see version numbers, names, and descriptions for each.  Make sure you have set the target URL as the right URL you want to use, and then pick the radio box for the application you wish to install.  Once you have done that, go to the top of the screen and hit the "Install" link. 

Now you can create a button for the Plesk panel to use (sort of like a shortcut) and setup other options such as the destination directory or if you would like to install it to http:// or https://.  Plesk will automatically pre-populate certain fields with default entries.  Feel free to modify them.

The last thing you will do to get your application installed would be to hit the OK button.  You should be redirected back to the first page and configure or remove your application from there.