The player may need to reinstall the game in order to achieve the correct checksum.
If, after launching the game, a different checksum is shown compared to what is expected, the player knows that their copy of the game may be missing key components or is corrupted in some way. Players can check the checksum to ensure their games were installed correctly. For instance, the EU4 manual shows an example of 'EU4 v1.00b (ce94)'.
The checksum will appear in the lower left corner of the main screen next to the version number.
