minniev wrote:
Update the OS to whatever OS the computer specs can handle, then try again to install Lightroom. You may not be able to get the most recent version of Lightroom to work but you should be able to get fairly close. You should be able to run a more current OS than Sierra, which is pretty old. As a subscriber, he has access to older versions of Lightroom if he has to back up a bit from the current iteration.
I have an older macbook lightroom 5should work.