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Revit is not backwards compatible.
Hi @Anonymous ,
Here is a link to an earlier question about this issue:
https://forums.autodesk.com/t5/revit-architecture-forum/revit-backward-compatibility/td-p/7852185
If my post was useful to you, would you be so kind and accept is as a solution.
Others can see That and Find That information better.
You can't go backwards. You can create an IFC file, then get that into an older version of Revit but it will be messy and not fun.
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