What exact version of Ligthroom do you have? This camera requires at least 2015.7.
Use Help > Updates to update to the latest version which is 2015.8..
If that doesn't work, you can download the update from here: Install Photoshop Lightroom
Also, if you're using dual-pixel files, take a look at this Working with Canon Dual Pixel raw CR2 files in Camera Raw and Lightroom
i have the exact same problem...I have the creative cloud with latest versions of Lightroom cc, photoshop and camera raw cc on my Mac book pro. When I connect the canon EOS 5D mark IV to the mac with the canon provided usd cable and run the import in Lightroom, Lightroom recognize the camera under DEVICES but show that no photos found.
what should I do? Please help!
Many times users think they have the latest update when in fact they don't. If you start Lightroom and go to the help menu and run system info, you can get the exact build number of the version you are running. Or, if you click on the About option in the help menu it will indicate the exact version of Lightroom you are running. Don't depend on the application manager telling you that everything is up to date. What exact version of Lightroom are you running? If you are running Lightroom CC, then it will be version CC 2015.10.1, Lightroom 6 will be Lightroom 6 .10 .1. The system info should show something like this:
the current versions installed are Lightroom CC 2015.10.1 and Camera Raw 9.10.1
these seem to be the latest versions so I don't get why it's not working.
Have you tried importing from a card reader, rather than a directly-connected camera (Lightroom's import function can be quite temperamental with directly-connected cameras)? If you don't have a card reader handy (I'd get one and use it as a preference), you could, outside Lightroom, copy the files off the card in the camera to a hard drive and then import into LR from the hard drive.
Yes, I did with the SD card, it works great but now I am using a compact fash card so it requires a card reader which I don't have.
So, I believe adobe should allow import by the cable - or am I asking for too much?
Lightroom does allow import by cable, and I'm sure many users still use that method, but over the years it seems to have become increasingly inconsistent and buggy. You could perhaps try a different USB cable and you may get lucky, but personally I think a good quality SD/CF card reader such as this one would be a good investment: http://www.lexar.com/products/card-readers/Lexar-Professional-USB-3-Dual-Slot-Reader.html
The problem is that Adobe have gone on record on their own forum some years ago, saying that bugs which only occur when importing from a connected camera are more than likely to be given a very low priority internally, simply because there's a relatively low cost easy workaround (and which many users would say is safer anyway).
So while I agree that you're not really asking too much, I'm just trying to give you a realistic assessment of the situation, and my best advice would be to get a card reader.
Thank you very much