Give us details.
Tell us the exact error message that appears when you try to import? We need the word-for-word error message, unedited, verbatim.
Tell us the exact make and model of the camera that took these RAW photos.
Also please state the version NUMBER of your Lightroom — we need the NUMBER and not words like "latest" or "up-to-date"
Also please state the version NUMBER of your operating system — we need the NUMBER and not words like "latest" or "up-to-date"
You can get the version numbers of both Lightroom and your operating system by going, in Lightroom, to Help>System Info.
If you are not getting an error message when importing, then let us know what is it that signals to you that you can't import - for example, are the images grayed out in the Import dialog?
When importing a raw file it states, first, Preview unavailable for this file (before pressing import). Then, when selecting import, a window appears: Some operations were not performed: the file is not recognized by the raw format support in lightroom.
Adobe photoshop LR V 6.0 (classic desktop)
Macbookpro oprtg 10.11.5
Camera-Cannon EOS 80D
If you reinstalled Lightroom 6 then you have Lightroom 6.0. That camera model requires at least Lightroom 6.5. You need to install the updates. The last update for Lightroom 6 was Lightroom 6 .14. It is available from the following website: