Inventor is NOT backwards compatible.. You CANNOT open newer files in older software and expect constraints to be maintained/feature tree (model browser) to be maintained,etc...
You can save your files to a neutral cad format like step/iges to then open them up in any version to bring in just the geometry. The constraints will be lost... The feature/model browser history will be gone..
You can utilize "ANYCAD" functionality to open a "reference" file in older versions provided you have updated that older version to include the translator capable of processing that newer version. Typically that takes a few months after a new version is released to push updates back 1 (maybe more) versions of software.. So a few months after 2021 is released 2020 gets an update to allow you to "reference" the newer 2021 files..
Thats it..
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Inventor 2023 - Dell Precision 5570
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