Revit is not Backward Compatible so you cannot open newer drawing version in older releases.
Once a model has been updated to a newer release it cannot be a saved in and earlier release either like AutoCAD.
There are a couple of workarounds using IFC but not ideal
Backward compatibility of Revit with earlier releases of the software (autodesk.com)
Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
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