That camera has been supported since Lightroom 2.1. What version are you running? What is the exact message you are receiving? If Lightroom is telling you the the images cannot be read, then it is a permissions issue that has to be resolved in your operating system.
Hi, I have Adobe Photoshop Lightroom 5.7.1. This is the message: The files are not recognized by the raw format support in Lightroom. (164).
I hope someone knows how to fix this.
I don't know a lot about Canon. But are these images saved in the sRaw format?