Rome Total War on Steam help

I recently downloaded rome total war on steam and installed the mod Europa Barbarorum. Is it possible to play it even though it was installed in program files (you cannot assign it anywhere else). It comes up with 'failed to load steam'. If there is any advice on how to make this mod work could you reply, it would be greatly appreciated.

https://forums.totalwar.org/vb/showthread.php?t=80270

The EB install guide tells you how to get it working with Steam.

thanks