RK, is Miriam getting confused between Lightroom and Photoshop? I don't use LR, but if that's where the error message is being generated, then maybe its LR8.4 she needs
http://www.adobe.com/support/downloads/detail.jsp?ftpID=5741
Miriam, I apologize if I am off track, but can you open Photoshop, and go Help > About Plugin > Camera RAW to see what version you have. If it is 8.3 as you say, then you might do better downloading and installing manually if using CS6. You should be able to use the Desktop Application manager to update ACR if using CC