You can download the old versions from here
https://forums.totalwar.org/vb/local_...php?linkid=546
What i did was install the game into a empty folder so you have all the files. All the UI pics,textures and unit models were in a .pak file so i had to get a pak extractor to get at them (theres a few in the modding sections of the forums). The descriptions of the units will be in the text folder found in the EB directory, in a file called EXPORT_UNITS.txt.
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