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The traffic wont work wit hout the fleet management services.. And also, the FMI 45 isnt compatible with your nuvi either way.
The FMI25 is compatible with your n uvi, but the traffic STILL would not work without the fleet management services.
If you can return the FMI45 cable you have and get a refund, I would do so. If you want traffic on your Nuvi 2639, you will need a traffic cable such as this one.
With that being said, If youd like me to call you and discuss this over the phone, I can send you that offer now. It would be an extra charge though, and wed simply arrive at the same outcome I described above.
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Senior Technician and Network Switching Systems Operator / Maintainer.