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Reinstall from macOS Recovery
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.
For that there are Apple’s built-in tools such as Disk Utility, or third party apps like CleanMyMac, MacBooster or the free OnyX, which include scripts you should run periodically. A good third party Mac cleaning app will remove the need for a reinstall or a clean install, since it removes all the junk files that trigger mischievous Mac behavior. May 30, 2019 4. Reinstall iTunes on Mac; 5. Reinstall iTunes of an Earlier Version; 1. Uninstall iTunes on Mac with Permission. The reason why you can't uninstall iTunes by simply dragging the app icon to Trash is that you don't have the proper permission of the app. Here are what you should do. Step 1: In the Finder, open Applications folder. When you buy a new Mac, it might be a good idea to do a clean installation; starting from scratch, with a brand-new operating system, and adding the files that you need manually. Here’s how to migrate your files to your new Mac, or do a clean installation, and the pros and cons of both methods. SplashID Mac Key Safe/Desktop app - bypass macOS Gatekeeper 8) Set the Mac desktop app sync settings to 'Mobile Device Overwrites Mac' for just this next sync - via Settings - Sync Settings for 8.x Mac Desktop app. 9) Please sync, and the data from iPhone/iPad will be re-synced back to desktop, and the Mac Desktop app should then work fine.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
Command (⌘)-R
Jan 11, 2019 There are two types of reinstallation. One installs a new copy of macOS Mojave over the current version and leaves everything else intact. The other erases your entire startup disk and installs a clean version of Mojave.The latter is more likely to fix problems and help your Mac run faster, but you’ll have to reinstall all your applications and reconfigure all your settings.
Reinstall the latest macOS that was installed on your Mac (recommended).
Option-⌘-R
Upgrade to the latest macOS that is compatible with your Mac.
Shift-Option-⌘-R
Reinstall the macOS that came with your Mac, or the closest version still available.
You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
When you see the utilities window, you have started up from macOS Recovery.
2. Decide whether to erase (format) your disk
You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.
3. Install macOS
When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.
- If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
- If the installer is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.
macOS Recovery exceptions
The version of macOS offered by macOS Recovery might vary in some cases:
- If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
- If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
- If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.
If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.
Other ways to install macOS
![Reinstall Mac Or Cleaning Apps Reinstall Mac Or Cleaning Apps](/uploads/1/2/6/4/126414480/114472178.jpg)
- You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
- Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.
When installing a major software update like macOS Catalina, you have the choice to start over from scratch with a fresh copy – as if you've purchased a brand new computer for the first time – or to simply install as usual, allowing you to continue working with the same settings and apps you've always had. Deciding which step to take is a personal one, but there are definitely benefits to both.
Why a clean install of macOS Catalina is good
It's like moving to a new house, with a fresh coat of paint and new flooring. Everything is new and you get to decide where to put the furniture. You can make your new home similar to your old one or completely redesign your living space.
It gives you the opportunity to rid your Mac of unnecessary bloat. All of those apps you tried once but decided you don't like? Gone. All of those downloads you never did anything with? Erased. Everything is clean and fresh and ready for a new start.
Thanks to services like Dropbox and iCloud, you can easily track down files and documents that you've kept backed up in the cloud. Any apps you previously downloaded on Mac can be redownloaded right from the Mac App Store. Even third-party, non-Mac App Store apps usually have a method to confirm a previous purchase (like a license download code). So, even though your apps may not be on your cleanly-installed Mac, you can usually get them back without much effort.
You'll need a level of patience and some extra time if you do a clean install of macOS Catalina. At first, you'll have to reenter passwords in Mail, sign back into iCloud and readjust your settings, redownload pictures in the Photos app (or redownload iCloud versions of them if you store the originals somewhere else), and a lot of other small, but time-consuming things. Remember, when you do a clean install, you are starting from scratch.
If you have the patience and some free time, a clean installation of macOS Catalina can be somewhat cathartic in its own right. It feels good to have a fresh start.
Why a standard installation of macOS Catalina is good
A clean install also means you lose everything. Similar to moving to a new house, there may have been a box in the garage that you never opened, but once you move, if you didn't take it with you, it's gone. Trying to figure out what happened to it could take a long time.
All of the tweaks and adjustments you've made over the years to your computer will be gone. Sound alerts, display options, keyboard settings – all of it will be reset to factory settings.
That's why restoring from a backup might be the best choice for you.
When you download and install macOS Catalina without starting from scratch, all of your apps, settings, files, and documents will be in the exact same spot that they were before. You will already be signed in to all of your apps and you won't have to redownload pictures from iCloud.
It is much faster to go from installation to being productive again when all of your apps and files are right where you left them.
It's like coming home late at night, in the dark. If you know where your bed is, your head will hit the pillow without you even having to think about it. If your furniture was all rearranged, you'd have to turn on the lights to see where you are going.
If you are too busy to spend time re-downloading apps and retweaking your system settings, a standard installation makes more sense than starting from scratch.
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Which one is better?
Erase And Reinstall Mac
I've done both. I usually install macOS updates from scratch on my MacBook Pro and install from a backup on my iMac. While I like that my MBP is clean (it feels like running a brand new computer), I don't like that I have to download every app that I need for work. Missing apps like 1Password and Dropbox immediately take me out of the game and drag my productivity to a crawl until I have what I need again.
It really is nice to have a clean installation on your computer, but if you are like me, it isn't worth the hassle.
That being said, if you mainly use your computer for browsing the internet, checking mail, or other non-work heavy activities, you might want to try a clean install.
What do you think?
What have you done previously? Do you usually do a clean install or standard installation? What are your plans for macOS Catalina?
Updated September 2019: Updated for macOS Catalina.
macOS Catalina
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