« Enable access for assistive devices » By searching the web on how to do that on OSX El Capitan, I stumbled upon that page that explains some ways. Then I designed a script to help you do so. It is as follow (copy/paste in script editor), (or open it directly in Script Editor by clicking here). The assistive devices are strong and perfect for many uses. Wonderful quality for the price. There is a complete set of tools that can be helpful to anyone who has limited ability to dress and care for themselves or any post operative limitations while healing. Note that with the new Apple two-factor authentication, you should be running OS X El Capitan and iOS 9 on all your devices. So, if you’ve already updated your iOS devices to iOS 9, and you’re updating your Mac to El Capitan, then you can turn this on. Find out more here. System Integrity Protection, or Rootless.

Apple Universal Access is a component of the Mac OS Xoperating system that provides computing abilities to people with visual impairment, hearing impairment, or physical disability.

Components[edit]

Universal Access is a preference pane of the System Preferences application. It includes four sub-components, each providing different options and settings.

Seeing[edit]

• Turn On/Off VoiceOver 10.4
• Turn On/Off Screen Zooming 10.2
• Inverse Colors (White on Black, also known as reverse colors), ⌘ Command+⌥ Option+Control+8 10.2
• Set Display to Greyscale (10.2 onwards)
• Enhance Contrast 10.3
• Enable Access for Assistive Devices 10.2
• Enable Text-To-Speech for Universal Access Preferences 10.2

Hearing[edit]

• Flash the screen when an alert sound occurs 10.2
• Raise/Lower Volume 10.2

Keyboard[edit]

• Sticky Keys (Treat a sequence of modifier keys as a key combo) 10.1
• Slow keys (Delay between key press and key acceptance) 10.1

Mouse[edit]

• Mouse Keys (Use the numeric keypad in place of the mouse) 10.1
• Mouse Pointer Delay 10.1
• Mouse Pointer Max Speed 10.1
• Mouse Pointer enlarging 10.1

External links[edit]

Check compatibility

You can upgrade to OS X El Capitan from OS X Snow Leopard or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.

MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009

To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X El Capitan, the installer will let you know.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download OS X El Capitan

For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.

Enable Access For Assistive Devices El Capitan

If you still need OS X El Capitan, use this link: Download OS X El Capitan. A file named InstallMacOSX.dmg will download to your Mac.

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Install the macOS installer

Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.

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Follow the onscreen instructions, which will guide you through the steps necessary to install.

Begin installation

After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X El Capitan.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.

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Learn more

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• OS X El Capitan won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
• You can use macOS Recovery to reinstall macOS.