It is expected to add the CAD version conversion function.

[tmac971031-eng]

Support CAD version downgrade, e.g. from CAD 2026 to CAD 2013 format.

[KnifeLemon]

Thanks for the idea! Today Filee always writes DWG and DXF as AutoCAD 2018. The library Filee uses for CAD can write older versions too, so letting you pick one, like 2013, fits well. I've opened #489 to track it.