In the CE59 software, click the button (usually an icon showing a radio pointing to a computer, or found under the Radio menu).
Go to Windows Device Manager, expand "Ports (COM & LPT)," and identify the number assigned to your cable. In the CE59 software, go to Setup > Comm Port and ensure it matches that number.
If you landed here searching for the "Vertex CE59 Software Download," you’ve likely just unboxed a rugged, no-frills two-way radio, or you’re staring at a "Code Plug Mismatch" error on a jobsite laptop. You don’t want a marketing page. You want the binary.