2015.3 is the Creative Cloud version of Lightroom. It is extremely similar to Lightroom 6.3 (but 2015.3 has dehaze and one or two other features that Lightroom 6.3 does not).
Your Canon 7D Mark II raw photos will import properly into Lightroom 2015.3 and also into Lightroom 6.3.
I had huge problems with the latest version of Lightroom (crashes every time I opened it or downloaded photos), so I went back to version 2015.3.
But 2015.3 IS the latest version. If you provide more details (and the version number with the problems), maybe we can tell you how to fix the problems.
Thank you so much for the very complete and helpful answer!!!
In response to your added remarks about 2015.3 being the latest version; The version that was virtually unusable was 2015.2.1 / 6.2.1. This version had the all new import format (and I was trying to learn to use it) but Lightroom crashed almost every time I attempted to import images. It crashed for no apparent reason whenever I was in the program. The version I'm now using (2015.3) has the old import format. I'm looking forward to an upgrade that will use the new import format AND be stable! Any idea when that version will be released?
I'm looking forward to an upgrade that will use the new import format AND be stable! Any idea when that version will be released?
It will not be released, as far as I know. The "new import format" has been abandoned by Adobe in favor of the "old import format".