This process will take some time, and you shouldn't unplug your iPhone from your Mac until the update is complete. ITunes will now install iOS 13 onto your iPhone.
Click on Downloads in the sidebar, or whichever location you downloaded the iOS 13 restore image to. While holding down the Option key on your Mac's keyboard, click Check for Update. You may be prompted to enter your iPhone's password on your phone. Click the iPhone icon that appears in iTunes. Open iTunes from your Dock or Applications folder. Click the Download button next to Xcode 11. Click Applications at the top of the list of beta software. 
Click on the iOS restore image that matches the device onto which you plan to install it. Go to the iOS 13 beta section and Download Restore Images. Log in with your developer account's username and password. Click on of the operating system buttons in the bar near the top of the screen. Control-click on your Backup and choose Archive.Īrchiving will prevent your current backup from being overwritten by an iOS 13 backup in the future, should you want to revert for any reason. 
(Or go to iTunes in the menu bar and click on Preferences. (Click on Encrypt Backup and add a password - you want the security.) (And enable Encrypted backup - it's worth it!) Make sure backup is set to This Computer.Click on the iPhone icon in the menu bar when it appears.Plug iPhone into your Mac or Windows PC.
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