For the poster try this
http://www.vwaskar.pwp.blueyonder.co.uk/fun/Owar.rar
Overwrite the file in the game folder, and also copy the file data6.owp into the same folder along with the crack.
I dont have the game to test it, but it seems to be the root folder of the game this data file goes to.
Or do a quick search of the games' sub folders for other .owp files, and place it there also.