Generic Error?

[Frank Presto]

When I first start and before I get to the first loading screen (with the copyright info) I get an error message on a black screen.

Generic Error:

Could not read file 'data/descr_battle_map_lighting_and_fog_controller.txt'

I have not been able to run the game before, and I am using version 0.81a.

[MarcusAureliusAntoninus]

You may have a corrupt download or corrupt install. Try reinstallying everything.