From the Autodesk App Store:
Using this app, you can upgrade multiple Autodesk® Revit® Projects (*.rvt), Templates (*.rte) or Families (*.rfa) to the most current version. Excludes Workshared Projects.
In addition, it can update links, duplicate folder structures, copy projects and families to new destinations, add prefix and suffix, and replace parts of names.
You also have the option to audit files during the upgrade process and delete backups from the destination folders.
Read more