If you check the official list Cameras supported by Camera Raw
you will see that the Canon 7D Mk 11 was only supported from LR 5.7.
Since Lightroom is presently at version LR 6.1.1 /Lightroom CC 2015.1.1 and there will be no further updates to Lightroom version 4, you have two options.
1. Upgrade to the latest version of Lightroom or
2. Download the latest version of Adobe DNG Converter 9.1.1 (free from Adobe) and convert the CR2 raw files from your Canon 7D Mk 11 to DNG format and then you can import the DNG files into LR 4.
Dear DdeGannes, very thank you for your complete answer. This makes me save a lot of time.