If your game crash, first of all, Subscribe to 2 needed Medieval mods and put them in right order in Mod Manager:
FIRST - Medieval 1100 AD Campaign [PART 1]
psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2280460874
SECOND - Medieval 1100 AD Campaign [PART 2]
psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1655284279

If not help, in 99,9% cases the problem on your side! Reason - you have some game files corrupted or invalid version of the game (TW launcher).


SOLUTIONS:

1. Verify game cache in steam.
2. Refuse to use Beta version of Rome 2 game (launcher) or old Patches. Check it in Library. Use Only last CA patch.
3. Enable mods and scripts in game settings.
4. Remove all mods except Part 1 and Part 2 from Mod Manager and Rome2/Data folder and from here:
C:\Steam\steamapps\workshop\content\214950

5. Delete this folders (make backup):
C:\Users\YOURNAME\AppData\Roaming\The Creative Assembly\Rome2\
C:\Users\YOURNAME\AppData\Roaming\The Creative Assembly\Launcher\

6. Verify game cache again.

7. Reinstall Windows/replace PC.



IF YOUR GAME FREEZES ON BATTLE LOADING SCREEN:

1. Launch the Game – Start Total War: Rome II
2. Open Task Manager
Press Ctrl + Shift + Esc to open Task Manager.
Alternatively, you can right-click on the taskbar and select Task Manager.
3. Go to the Details Tab
In Task Manager, click on the Details tab at the top.
Look for rome2.exe in the list of running processes.
4. Set CPU Affinity
Right-click rome2.exe and select Set Affinity from the dropdown menu.
5. Unselect Some CPU Cores
A window will appear showing which CPU cores the game is using.
Uncheck a few cores (for example, if you have 6 cores, uncheck CPU 9 to 11).
Click OK to apply the changes.
6. Resume the Game
This fix can be applied even if the game has already frozen—just follow the same steps to unfreeze it.