Can I get ADC freely?Yes, you can get the application for free through the official website. I have accessed the website and the ADC is available for downloading and installation. There is also a patch to update various files on the original version. Browse to the page provided below then locate the section on the right to download the application. Download page: http://www.ukho.gov.uk/ProductsandServices/ADCatalogue/Pages/Home.aspx
Admiralty Digital Catalogue is a program that provides a comprehensive and up to date reference in graphical and textual form of the range of Admiralty products and services, including Standard Navigational Charts, Publications and the AVCS, ARCS and Admiralty ECDIS Services. It also contains Temporary and Preliminary Notices to Mariners (T&P NMs) and Data Assessment Notes.