If you shoot with a Canon 5d Mk IV using the 'standard' RAW format (or, of course, using jpeg) Lightroom 6 can handle the files directly. If you use Canon's new Dual Pixel RAW format you need to pre-process the images using Canon's own software: https://helpx.adobe.com/uk/x-productkb/multi/editing-canon-dual-pixel-raw-cr2.html
15:06 Thu 28th Feb 2019