After I posted this question I then lost track of it, sorry.
I did find a solution, on the Steam forums. CAW can be installed with Sims on Steam with a simple registry tweak.
Here is the link to the tweak instructions, for anyone else having this problem. https://steamcommunity.com/sharedfiles/filedetails/?id=277022926
I was also pointed to this page explaining how to switch a Sim game over to Origin. http://ts3tutorials.forumotion.com/t130-steam-installation-and-caw-by-littleminxundr#244
Personally, switching to Origin was an unacceptable solution to me. Others may want to switch to it however.
