While i myself have the game and everything sorted, my friend who did not have enough space on his c drive is struggling to install Rise Of The Witch King, as it's autorun.exe installer is not recognising his downloaded BFME II, which i can confirm works fine. ( it is located in a larger drive my friend uses.)
I have done some searching and found very little on the issue on installing Rise Of The Witch King onto a different drive.
I fear a similar issue would present itself when we get round to installing Edain and Age Of The Ring.
Any help would be appreciated, thanks.