Open data created in a newer version than the IRONCAD you are using
Data created and saved in the new version cannot be opened in the old version.
Again,IRONCAD 3D data cannot be stored in older versions of IRONCAD.
If you want to open data created with a new version of IRONCAD, export it to an intermediate file (Parasolid, ACIS, STEP, etc.) and import the exported data with IRONCAD.

The data exported to the intermediate file will no longer have a creation history and become a Brep part.
See the article at the link below on how to edit data without history (Brep).
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