Firmware update N104 NAS in Windows ver 6.1.6 to 6.2.5

I am unable to locate the firmware for my N104 NAS which currently is 6.1.6 in the Admin Page.  I believe I require v6.2.5. Its in a Windows 10 environment in my Home office.      The usual Update returns an error Code=6001010060 which i believe is a Checksum issue 

 Any assistance would be greatly appreciated.