Revit Personal Accelerator is a Windows application that runs alongside Revit and is designed to optimize performance when working on Revit Cloud Models. It can be viewed in the Windows system tray.
It is installed with Revit and can be updated by either the latest version of Revit or from https://manage.autodesk.com/products/updates when new features are delivered in between Revit releases.
The Revit Personal Accelerator works with all versions of Revit. As new updates are released, some functionality may be specific to certain versions of Revit. However the application itself and core optimization functionality are compatible with all Revit versions.