To install an Application:
1) Login in to your Plesk Control Panel.
2) Click on "Applications" tab as marked in red.
3) Click on install button in front of your application which you want to install.
4) Here you can select the path where you want to install your application.After selection click on install.
5) Here you can see that your application was successfully installed. 
6) Here is the your installed application in red marked box.
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