I am having a similar issue when trying to download Drivestation for Ministation Slim, however, I do not believe the support website region vs product S/N region is the issue in this case.
my product:
HD-PCF500U3B-US
i have attempted to enter the S/N on the back of the device as the 14 digit number only, as well as the 14 digit number + the letter that follows. Neither have been successful.
Any ideas on what the issue may be?
As a workaround, anyone just want to send me the file?