With CS 5 the latest version of the camera raw that can be used is 6.7.
7.0 onwards are compatible only with CS 6.
Now for LR 4, i would like to inform you that LR itself is a camera raw and you need not to install Camera raw on top of LR.
when you install LR 4.2, camera raw 7.2 is also installed as its part of LR installation.
So i would suggest , incase you have any concerns , then you should uninstall LR and then reinstall LR 4.2 by downloading it from here : http://www.adobe.com/support/downloads/detail.jsp?ftpID=5487
Moving this discussion to the Adobe Camera RAW forum.