Could you please let me know the version of Lightroom installed on the computer .
Also which version of MAC are you working on ?
Did you try to uninstall and reinstall Lightroom once on the computer ?
Lightroom CC 2015.3, on 10.11.2. Aperture 3.6.
I only just installed Lightroom. And it appears I can't uninstall it anyway - the Creative Cloud app just says "Waiting", sometimes failing with no explanation after a while, or, more recently, now when I tell it to Uninstall it does nothing at all. Even after I relaunch the app.
Though it does now list Photoshop as not installed, which it was, and in fact still is. Tangentially, [until now] I've been trying to update that for days and it just fails over and over again.
The Creative Cloud app got tremendously buggy - typically crashing on launch - as of around El Capitan.
That uninstaller worked. It took a long time to get it to reinstall though - I had to uninstall and reinstall the entire Creative Cloud app.
Now the Aperture & iPhoto import options are available. Thanks. Though it'd be nice if it hadn't taken two hours to change the colour of a menu item.