Bought a disk copy of C&D off ebay and was expecting the code not to work so intended to install it with the disk itself. The file from the disk is saying that I do not have the base game installed, which I think is because I downloaded it from Steam. Any ways to make it recognise the steam file or should I just try to get a refund?
EvrythngWasTaken Sims 4 content for PC/Mac can't be installed via disc at all. And even if it could, you'd still need a valid code for the EA App to recognize your right to run the content. Steam doesn't support discs or their codes, but if you did have a valid code registered within the EA App, you could download the associated content into your Steam install. But that's moot at this point.
So yes, you should try to get a refund for your purchase. If you wait a week or so, most or all Sims 4 DLC should be on sale for the winter holidays. While it's probably not going to be as cheap as the disc you bought, 50-60% off is substantial.
