This might help with the 1.3 install problems. Helped me...

https://forums.totalwar.org/vb/showthread.php?t=55608


There is also a patch type file @ TWC that unlocks all 1.3 RTW factions and puts some nice descriptions for factions where there are none. But can't find the link :(

You can start here though>> http://www.twcenter.net/downloads/db/?cat_id=1


Hope this helps