Hi.
If you are trying to update the esc you have to first update the programming box.
I'm guessing your downloading this...
http://www.hobbywing.com/upload/soft....64_111011.rar
In order for it to work you have to unzip the file first and put in folder on the desktop, then uninstall version 1.63 on your pc. I used winRAR to unzip it which you can get free.
Then you can install 1.64.
Once you done that, connect the programming box to pc with the usb connection and open hobbywing 1.64 and click on devices and then goto 2 in 1 programming box and click on that. you should be able to choose the latest firmware to update the box.
Once you done that connect the speedo to the box and switch it on. Goto devices and click on esc speed controller and then you can update the speedo.
Hopefully that should do it.