Sorry -
Log into your Prinergy Primary server: Cmd+K and enter ip address in Server Address window and hit Connect button. This should show you the available volumes on the Primary, one of which should be WkspInstall. Choose the WkspInstall volume and open it when it appears on your desktop. Installers for Mac and Windows are here. When you run the installer, you'll see the options available. I think you need to include both Workshop and VPS along with the Acrobat 8 plugins when you install because an uninstaller runs first and if you do not put a check in the Workshop and VPS boxes, it will uninstall but not re-install those apps.
-Dan