Not sure what you mean by "upgrade path", but logistically 3.x does require paying for new license(s). FWIW, I migrated directly from 2.6 to 3.1, bypassing 3.0 and 3.0.1.
The documentation you're looking for is probably something along the lines of "Data Migration Guide for LAN Management Solution 3.1", which lists topics such as "LMS 2.6 or LMS 2.6 Service Pack (SP1) to LMS 3.1":
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
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investigation, the there is 1s delay between the client KEXDH_INIT and
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Introduction The purpose of this document is to demonstrate the Open
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