The latest Navdata cycle for add-ons that use the Navigraph service is now available for download at their site.
For those unaware of the service, Navigraph provide updated navigational information (airways, fixes, radio navaids, airports) for applications such as advanced airliner package Flight Management Systems, flight planners and suchlike.
Each Navdata cycle costs 20 credits, independent on the number of addons/downloads you make during that cycle. They also offer an annual cycle package (13 cycles) for 200 credits – a 23% discount compared to purchasing each cycle individually. Credits can be purchased from simMarket here.