Upgrade to Maps

Hi

I am running a 58 Superb 2 which has never been updated for maps.

Simple question. How do I go about uploading the latest version of mapping? it has never been uplifted since the vehicle was made although the firmware was uplifted about 5-6 years ago.

Is my only option to go to a dealer or is the people of the group who have a copy of the disk that charge a lower fee?

apologies if I am asking a question that I shouldn't be asking and feel free to delete the thread if I have asked an "illegal" question.

I am in South Wales.