Because of evolution of Millumin V3, its projects cannot be opened with Millumin V2.
This is very common when a major version of a software is released.
If you don't have any solution, please write us an email with your project (just the .millumin file) and we'll see what we can do. But I cannto guarantee anything for now. Also, please explain us whhy you need to downgrade your project.
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