When new model data (more precisely "shared data", a copy of the DB data) are published, you will see an update screen in the pilot client. Those data include airline data, model data, new liveries etc. New data will be published if new mappings (Mapping, matching and model set explained (theory and concepts)) are created, data are corrected, new airlines are added. It will NOT update the program, only data.
This update will do two things.
- download the latest model data (ICAO codes, models, liveries ....)
- consolidate the data, see Why is data consolidation needed?. This means your model set data are updated.
Remark: When you run the mapping tool the latest DB data will be automatically downloaded, so in that case you already have the latest data .