I have recenetly discovered this mod, I installed 6.3 and then got the 6.4 exe downloaded. Everything seemed to be working, but in setup when I chose a campaign (Late or Early) it says:

Error while processing watchtowers.txt

File does not exist:
data/world/maps/campaign/imperial_campaign/descr_strat.txt

Where did I go wrong in the install? How do I fix this problem?
Thanks