In the options menu, on the left side about 2/3rds from the top is a selection called "Configure Figure Versions . . ." when you select that another window opens and at the bottom is a selection to set the horses to 'Classic' or 'Catacombs'. Setting horses to 'Catacombs' should let your system display the advanced horses.
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The art of war is simple enough. Find out where your enemy is.
Get at him as soon as you can. Strike him as hard as you can,
and keep moving. - Ulysses S. Grant
Only the dead have seen the end of war - Plato