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HelpDesk 2019 suite is a bundle that saves you $240. It includes products that can help you with customization of your HelpDesk. Forms Designer is already included in HelpDesk pricing, but you can customize only Tickets and Contacts list. Thus, you may need the full version to customize additional lists. Dashboard Designer will be helpful in the creation of new HelpDesk reports.
You can find the list of all bundles on the main store page. The bundle includes products for SharePoint 2019: