Logic Pro 9.1.8 Works on Macbook Pro not IMAC
I use a Macbook pro (2010) and more recently an IMac (2015) Both use OS X El Capitan. Logic Pro 9.1.8 runs on the Macbook fine but the iMac says it's incompatible with El Capitan and won't even try. On the Macbook, Logic was already installed when I upgraded to El Capitan. In the iMac El Capitan was on there first. Why is the incompatibility inconsistent and How can I get the iMac to just try
iMac with Retina 5K display, OS X El Capitan (10.11.4)