This specific version (v1.4.0.3) is often found on game distribution sites like Download.ir and typically includes the base game along with its major expansions:
If you are looking for the official update notes , this version primarily finalized the content and addressed bugs following the expansion's launch. File: Age.of.Wonders.Planetfall.v1.4.0.3.zip ...
: Adds the Oathbound faction and the Grail Configurations. Invasions : Introduces the Shakarn and Therians. This specific version (v1