Exporting package from Unity 4 for Unity 3.5?

I have a unity package which was exported out of Unity 4. Now when I import this package into Unity 3.5, I get an error message:

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How can I export a package from Unity 4 that will be compatible with Unity 3.5?

It’s not possible. If you need a package to import into Unity 3.5, it needs to be exported from Unity 3.5 (or lower).