NavSherpa can be installed with Dynamics NAV 2016 or later.
NavSherpa has been tested with Microsoft SharePoint 2013 and Microsoft SharePoint 2016 (on-premise) and SharePoint Online (Office 365).
Actually not but such an opportunity is under our consideration.
Each partner would receive full package including objects, training materials, online help and other necessary resources for the time being.
Our decision was not to develop workflow features inside NAV (such as workflow diagrams, lazy approvals or mobile applications) because we believe that best-of-breed applications should be integrated to achieve the best possible result.
That is why NavSherpa was designed to provide workflow automation with external workflow platforms out-of-the-box. Try to use our deployment scenarios and you can manage your first work flows in one hour without any deeper knowledge. With Office 365 subscription, you can start to use workflow in NAV immediately.
To start really "fast and easy" we recommend to use internal SharePoint Workflow (included in Microsoft SharePoint) or even better Microsoft Flow (part of Office 365 subscription).