Could you build a false floor under the vinyl, just lay some thin strips of wood and then either wire mesh (probably my preference) or wood on top before putting the vinyl back down? I can't see how it is ever going to dry out enough otherwise. Longterm you need to work out where it is coming from to really deal with it though, and that is likely to mean creating an airflow underneath that is rat proof. Airbricks perhaps, or metal mesh.
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