In Lightoom Preferences > Performance try unchecking Use Graphics Processor.
Nothing, and I even converted the arw's to dng using camera raw app and those converts still don't even open.
Actually scratch that, something odd happened because I noticed the CR2 files won't even open now in develop... Will reply back after some troubleshooting.
Please reply back with actual text showing LR version, license status, and GPU.
Words like "latest" just will not do.
In LR, click on Help, click on System Information, in the screen that pops up, click on copy, Paste that copy in your next response.