I spent the better part of yesterday afternoon and evening installing and setting up El Capitan on my Mini internal HD. So far the only glitch I have encountered is NO alerts sounds in Mail for new mail, checking mail etc.
This morning I booted into my Mavericks, 10.9.5, clone on my external HD. Navigated to the Applications folder for El Capitan on my internal HD and proceeded to delete all of the language files for all the newly installed/updated apps. Also deleted Chess, Calculator and Stickies.
Rebooted into El Capitan on my internal HD and so far as I can tell all of the apps are opening and operating normally.
