It looks like you're looking for content related to a specific community or server event: "Ukraine to Bovi4 Exclusive" (likely a custom map or a server migration/event).
It is almost certainly a that someone misinterpreted as a real update or exclusive release. The most realistic scenario is a Ukrainian CS 1.6 server operator renaming a map to bovi4 and calling it “exclusive” for regular players — but no such map has been documented publicly.