If you don't own the software, you can use the Revit 30-day trial to perform one-time batch conversions. Autodesk Viewer can view files, but it does not support exporting to DWG.
: If you do not own the software, you can download a trial version to perform the conversion. Users on the Autodesk Community often suggest this as a cost-effective one-time solution. Online & Automated Conversion Tools rfa to dwg online convert hot
Understanding why is trending helps you use the output correctly: If you don't own the software, you can
: If you don't own Revit, you can download the Autodesk Revit Trial to perform one-time conversions for free. If you don't own the software