Oct 24, 2019  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. Dec 04, 2017  Question: Q: Certificates broken after El Capitan upgrade: 'Connection insecure' I have now upgraded two Macs to El Capitan, and in both instances the Certificates have been corrupted. The first Mac was the day after El Cap launch, and the 2nd was today - so a significant period of time has elapsed for this to be fixed. El capitan certifcate request for app development.

Apple Unveiled Yosemite: Here's What to Expect in Mac OS X 10.10 How To: Get the Public Beta Preview of Mac OS X 10.11 El Capitan How To: Run Windows inside Mac OS X How To: Get Mac OS X's App Dock on Your Windows PC.

Share content with AirDrop

1. Open the file that you want to send, then click Share button in the app window. Or Control-click the file in the Finder, then choose Share from the shortcut menu.
2. Choose AirDrop from the sharing options listed.
3. Choose a recipient from the AirDrop sheet:
   

Or open an AirDrop window, then drag files to the recipient:

1. Select AirDrop in the sidebar of a Finder window. Or choose Go > AirDrop from the menu bar.
2. The AirDrop window shows nearby AirDrop users. Drag one or more documents, photos, or other files to the recipient shown in the window.
   

You can also share content from your iPhone, iPad, or iPod touch.

Receive content with AirDrop

When someone nearby attempts to send you files using AirDrop, you see their request as a notification, or as a message in the AirDrop window. Click Accept to save the files to your Downloads folder.

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If you can't see the other device in AirDrop

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Make sure that your devices meet these requirements:

• Both devices are within 30 feet (9 meters) of each other and have Wi-Fi and Bluetooth turned on.
• Each Mac was introduced in 2012 or later (excluding the 2012 Mac Pro) and is using OS X Yosemite or later. To find out, choose Apple menu  > About This Mac.
• Each iPhone, iPad, or iPod touch is using iOS 7 or later, with Personal Hotspot turned off.

What is ci cd for ios android uwp and macos. Make sure that your devices can receive AirDrop requests:

• Choose Go > AirDrop from the menu bar in the Finder, then check the ”Allow me to be discovered by” setting in the AirDrop window. iPhone, iPad, and iPod touch have a similar setting. If set to receive from Contacts Only, both devices must be signed in to iCloud, and the email address or phone number associated with the sender's Apple ID must be in the Contacts app of the receiving device.
• Choose Apple menu  > System Preferences, then click Security & Privacy. Click the Firewall tab, then click the lock and enter your administrator password when prompted. Click Firewall Options, then deselect “Block all incoming connections.”