A download from Unreal marketplace package includes more than geometry. The version compatibility review should cover license scope, dependencies, version assumptions, and the structure of the delivered package.
For Unreal marketplace package, classify each important feature as preserved, translated, approximated, or dropped. Test the same file in both directions so a successful open does not hide data loss.
Record the authoring version, tested import versions, renderer assumptions, deprecated features, and upgrade fallback. Apply this version compatibility guidance to the actual Unreal marketplace package delivery path.