Login in Plesk Control Panel.
Go to Domains , it will list domains in control panel .
Find & Click on Manage Hosting in front of Domains.
Click on Applications , it will list the applications.
Click on All Available Applications > Collaboration
Select the CubeCart application and click on Install.
Check to accept term & condition and click on Next.
Specify the location where CubeCart will install and click Install.
CubeCart has been installed. Click on CubeCart for admin section & Click on Administrative interface for Website