Autodesk have released a subscription-only update to AutoCAD Plant 3D 2017. The Autodesk Blog "In the Pipes" has published a post on how to download and install the update, below is a small extract.
Plant 3D 2017.1 Update
In a continuing effort to provide high-quality products, Autodesk has released AutoCAD Plant 3D 2017.1 Update. This release includes updates, such as Spec Driven P&ID, and fixes to issues found through internal testing and customer error reporting. The Plant 3D 2017.1 Update is available only to subscription customers. Access and download the Plant 3D 2017.1 update through Autodesk Account Management.
On the Autodesk Account Management website locate Plant 3D by selecting All Products & Services.
Find out more about AutoCAD Plant 3D here