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Skip to main content. Start your free trial. The primary discussions are written for advanced-beginner or intermediate Mac fans. Some chapters come with free downloadable appendixes-PDF documents, available on this.
It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system. A file named InstallOS. Double-click the downloaded file to open a window showing its contents.
Then double-click the file within, named InstallOS. Step 4. Some Mac users have the habit of backing up their data and files to iCloud. To these Mac users, it seems to be good news when their files are missing or lost after macOS update.
Tips: To restore contacts, bookmarks, calendars, and reminders from iCloud, click the corresponding option under Advanced. Check the files you want to restore or click 'Select All' if you really need to restore everything. Click the Restore button to recover them. A snapshot will automatically be taken once the install or update of your macOS starts. You need to agree to the license terms so to enable snapshots to start. A snapshot contains the current state of the target disk, including files, macOS version, etc.
If you don't want to revert macOS Catalina or Mojave to the previous state, go back to solution 1 and let reliable Mac file recovery software help. Select the Mac startup disk and click 'Continue'. A list of snapshots will be displayed sorted by date with the created image of macOS version. Select the snapshot you wish to restore from, then click 'Continue'. You will see a process bar, and your Mac will reboot automatically when the recovery is over. After Mac reboots, you can see and access your lost files on your Mac with the previous macOS.
If you still want to update to the latest macOS, back up your Mac data and try again. This page covers 4 practical files to help Mac users to restore missing or lost files due to macOS update. If macOS Catalina or Mojave update deletes everything from your Mac, you can restore lost files from your backup:. If you have no backup, don't worry. It will fully scan and find all your lost Mac files deleted by macOS update in only three steps.
This page has solved the problem with four workable solutions: Workable Solutions Step-by-step Troubleshooting Fix 1. Full steps Fix 2. Restore from Time Machine Backup Step 1. Open up Launchpad on Mac, click 'Others'. Find and enter Time Machine Full steps Fix 3.
Recover from iCloud Backup Open Cloud. Full steps Fix 4. Support Second Screen: Catalina also offers second screen support for utilizing iPads as a companion second screen from Mac computers. Sidecar - use your iPad as drawing tablet: After connecting the iPad through Sidecar, users can use Apple pencil to draw and annotate things to iPad. Updated Photos App: The Photos app curates and features your best photos, removing poor-quality photos and duplicate shots.
Why macOS update deleted everything Generally, a subsequent major release of macOS won't erase or touch user data. Upgrades doesn't negate the possibility of going wrong, and in the unlikely case, you may lose access to data due to the following causes: Hard drive failure or file system error Unfinished macOS update, macOS update failure, or OS crash Not enough space on the hard drive for OS update Is lost data recoverable?
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