Inventor 2019.4 is an update that lets you work with others who are on Inventor 2020. This update also makes some changes to the Constraint command.

AnyCAD for Inventor

Reference Future (newer) Versions of Inventor Part and Assembly Files

You can now reference an Inventor 2020 part or assembly file in Inventor 2019.

You must have Inventor 2019.4 installed to support opening 2020 part and assembly files. Inventor 2019.4 can be downloaded via the Autodesk desktop app or from https://manage.autodesk.com.

Use the Open, Place, or Derive command to create a reference to a future version of an Inventor part or assembly file.

Migration: If you open and save the file in a newer version of Inventor (or use Task Scheduler to migrate files with references to future versions) the future version references are migrated to standard Inventor Place and Derive relationships.

For more information, see About AnyCAD for Inventor.