how to upgrade to OS X 10.11

Hello nadirfromwealdstone,

Can your Mac use El Capitan?

OS X El Capitan requires any of the following Mac models and versions of OS X.* It also requires at least 2GB of memory and 8.8GB of storage space. To find your model, memory, storage, and macOS version, choose About This Mac from the Apple () menu.

• iMac models from mid 2007 or later
• MacBook models from late 2008 or later
• MacBook Pro models from mid 2007 or later
• MacBook Air models from late 2008 or later
• Mac mini models from early 2009 or later
• Mac Pro models from early 2008 or later
• Xserve models from early 2009

• OS X Yosemite
• OS X Mavericks
• OS X Mountain Lion
• OS X Lion
• OS X Snow Leopard

If your Mac doesn't support High Sierra, or you're using Snow Leopard or Lion and would like to upgrade to High Sierra, follow these steps:

1. Use this link to open the El Capitan page on the App Store: Get OS X El Capitan.
2. Click the Download button on the El Capitan page. If your Mac is compatible with El Capitan, a file named Install OS X El Capitan downloads to your Applications folder.
3. After download is complete, the installer opens automatically. Click Continue and follow the onscreen instructions.

What OS are you using now?

Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.

Application Compatibility

El Capitan 10.11 Compatibility information

macOS Sierra 10.12: Compatible Apps

Also check to make sure there is a compatible driver for your printer.

Do a backup before installing, preferable 2 backups on 2 different drives.