Summary: The WIP has a time limit. What happens when it expires?
The expiration ensures that everyone is testing the latest version and not reporting problems that have already been fixed. Before each RhinoWIP version expires, a new WIP will be available for you to you download. RhinoWIP checks for updates each time it starts and will notify you if a new version is available. A notice will also be posted on the Rhino for Mac section of the Discourse Forum each time a new Rhino WIP version is available.
See also: Rhino for Mac Work-In-Progress.