Firs, sorry for my English.
Second, I miss new thread because is too old device but if I am wrong, please correct me.

I use windows 8.1. Mapsource with newest GPS USB drivers can't detect StreetPilot2610. I rode to [email protected] and exchanged a couple of mails. Every time they answer me with trivial way. I have attached a screen shots and details, but they "don't understand" me and offered to tray with BaseCamp but situation is same.
This part was expected.

I have decided to tray on machine with WIN 7. Put the OLD version 2.0C, add the OLD USB driver (from 2010) and BaseCamp and Mapsource saw my StreetPilot2610 immediately .
Tray some option, transfer, every thing was perfect. In the meantime I decide to update the Mapsource AND I LOST THE GPS CONNECTION with PC.

Back in WIN 8.1. I have try to install the old version of BaseCamp but installation doesn't start. Nothing was happen.
Again on WIN 7. Unexpectedly I decide to try to reinstall the OLD USB driver in WIN 7 even without installing the old one. This experiment was positive. Every thing run perfect. Probably the update of BaseCamp and Mapsource provide the new USB driver which is crucial.

Back on WIN 8.1. Reinstall the BaseCamp and Mapsource. Run *.exe for old USB driver. No, effect is zero. No connection. Every thing was without effect. In device manager is appearing an yellow exclamation mark in any time ( with on or off Map Source and Base Camp).
My opinion is that the problem is in USB driver. It is not compatible with WINDOWS 8.1

I hope this help some one else.

Поздрави
REGARDS.