Rhino 8 to Rhino 7 conversion

Hello, I have a rhino 8 file but I have installed Rhino 7. How can I convert the file from Rhino 8 to Rhino 7?
Thank you

Install Rhino 8 trial version then save as a Rhino 7 file

Convert3dm is a simple command-line utility that reads a 3dm file and writes a new 3dm file using the specified file version.
Convert3dm support Rhino file versions 1 through 8.
Convert3dm works on both Windows and Mac, and it does not require Rhino to be installed.
Convert3dm is free!

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