Lightroom 4 has not been tested on Mac 10.11.3 as it an old version : System requirements for Photoshop Lightroom for Mac and Windows OS
You can install and check if that works for you.
thanks for the quick answer! I was just wondering if
is the minimum requirement or if it ONLY runs on these versions.
These are the versions of Mac OS on which it has been tested and works successfully.
On the higher versions, it has not been tested so that could lead to some compatibility issues.