If that doesn't work, i may have found a solution to the crashes related to Patch 9.
My game crashed at startup since Patch 9.
Some other games had this issue aswell so i tried following, with succes:
-Go to %appdata%/Roaming/The Creative Assembly/Rome2/Scripts/
(Start > search bar > %appdata%)
-Open: preferences.script.txt
-Search the following (CTRL + F): directx
-You should find the following line:
gfx_enable_directx11 true; # gfx_enable_directx11 <bool>, Enable DirectX 11 rendering #
-Change the "true" to "false", so it looks like this:
gfx_enable_directx11 true; # gfx_enable_directx11 <bool>, Enable DirectX 11 rendering #
-Save and close the file.
-Launch the game, and it should hopefully work :)