Error message when selecting devo 7E dfu file?

Hi, I have just acquired a Devo 7E,
Decided to upgrad the firmware to 4.01.
installed the Dfuse v2.0 and downloaded the deviation-devo7e-v4.0.1 zip file.
when I click in the ... to browse and select the dfu file I get an error message "this file doesn't have the correct format"

New to this - not sure what to do from here? did I do something wrong?

Hiya, managed to fix it by downloading it again and it worked... not sure why it didn't work the first time...
Firmware now fully upgraded to v4.01