Yes, if you have a Dedicated Server or VPS and we install QuickInstall, it will be available to your direct clients.
In WHM, you can enable this icon for any cPanel using your custom Feature List.
(Read "How to limit which icons appear in cPanel via Feature Manager".)
QuickInstall is automatically installed and available to all Shared and Reseller plans.
Currently, QuickInstall is not available with Plesk. This means it cannot be included with Windows Shared, VPS with Plesk, nor Windows Dedicated server plans.
To read more about QuickInstall, please visit the QuickInstall Overview.