Oct 07, 2019 As outlandish it may sound, but you have the complete option of clean installing macOS Catalina on your compatible Mac as long as you have a fast enough internet connection - no USB installer.
Jun 16, 2020 If you're using one of these computers with OS X Mavericks or later,. you can install macOS Catalina.Your Mac also needs at least 4GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier. MacBook introduced in 2015 or later MacBook Air introduced in 2012 or later MacBook Pro introduced in 2012 or later.
With macOS Catalina officially released, more and more people jump on the bandwagon to try its expanded features, such as screen extension with an iPad or the new Apple Podcasts app. And why not?
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The problem is that it might not always work as intended. Glitches in macOS Catalina are commonplace — even fully released operating systems like Mojave or High Sierra could freeze and crash from time to time. No software is immune.
But what do you do if this case? The surefire way to deal with jaded performance is to reinstall mac OS Catalina altogether. Read through our guide below to learn how.
How To Reinstall Mac OS Catalina
It’s important to note that when you reinstall macOS Catalina the process simply updates the operating system and doesn’t affect any files on your hard drive or user files or even settings. That makes reinstalling principally different from performing a clean install, which erases everything.
Here are the proper steps to follow to reinstall mac OS Catalina.
1. Back up your Mac first
By default, the best thing you could do before making any significant changes to how your Mac works is to back it up. Backups are just like saves before encountering challenges in video games — represent the point you can always come back to.
There are lots of great backup solutions on the market to suit every need. If you don’t have the time to search for something specific, your Mac features a decent native option — Time Machine.
To get Time Machine started:
Connect an external USB or WiFi hard drive to your Mac
Go System Preferences ➙ Time Machine
Click on Select Backup Disk…
Press Use Disk
2. Delete junk off your Mac to speed it up
There’s nothing better than the feeling of a brand new Mac with a brand new macOS. If only the latter is new, the experience could be subpar. Trying to get the most out of macOS Catalina on your older machine might be a challenge. But don’t hurry to your local Apple Store just yet — not all is lost.
Just like the dust behind your couch or on the top of your kitchen cupboards, small bits of system files, caches, and hidden libraries tend to aggregate over the years and never get deleted, eventually slowing down everyday processes. While it’s possible to clear out some of them manually, others require specific technical knowledge and lots of time.
Luckily, there’s a professional automatic solution available — CleanMyMac X. Optimizing behind-the-curtain processes on your Mac with CleanMyMac X is no more difficult than clicking a single button:
Download a free trial of CleanMyMac X
Open the app and navigate to System Junk in the left-side panel
Click Scan and wait for the process to complete
When done, press Review Details
Uncheck anything you’d like to keep and click Clean
Now your Mac is free of all the pointless log files, user caches, language files, old updates, and more. Which directly translates into improved processing power, memory usage, and response time. At last, your Mac is ready to take full advantage of macOS Catalina.
3. Reinstall macOS Catalina in Recovery Mode
With your Mac in top shape, it’s time to get that macOS Catalina download link. Surprisingly, you won’t find it in Software Update or even App Store (where it used to be in macOS High Sierra).
The correct way to reinstall macOS Catalina is to use your Mac’s Recovery Mode:
Restart your Mac and then hold down ⌘ + R to activate Recovery Mode
In the first window, select Reinstall macOS ➙ Continue
Agree to the Terms & Conditions
Select the hard drive you’d like to reinstall mac OS Catalina to and click Install
The reinstallation process will start shortly and roughly take 30 minutes. When complete, your Mac will start up as usual. No files should be lost, but it’s always a good idea to check CleanMyMac X’s Applications Updater to see if you can improve compatibility of the new macOS with any of your existing apps:
Launch CleanMyMac X
In the left-side panel, navigate to Updater
View any available updates and their notes and click on Update
Finally, in case you notice any files or apps missing, or settings misconfigured, you could open up Time Machine to restore a specific folder or the whole backup from the step one:
Launch Time Machine from Applications
Simply scroll all backup versions to find the file you’re looking for
Click Restore
If you decide to restore the whole backup, make sure to then repeat the whole process to optimize your Mac and reinstall macOS Catalina as detailed above. The good thing is that more often than not the reinstallation works wonders right from the first time.
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If something doesn't quite work right after you've installed macOS Catalina, you can reinstall the operating system so it is a fresh copy. Reinstalling a fresh copy of macOS Catalina will not affect your current settings. Applications and settings will remain the same. Completing this process replaces the core files of macOS Catalina in case something wasn't working right before.
Before you start: Back up your data
It is a good idea to perform one full backup before starting with a clean copy of macOS Catalina. You can also back up files and documents using a cloud-based storage system like Dropbox, OneDrive, or the easiest: iCloud.
Make sure the computer on which you're installing a fresh copy of macOS Catalina can be connected to the internet, either via Wi-Fi or Ethernet. This step is important. An Internet connection is needed in order to reinstall the macOS operating system.
If you are using a laptop, make sure it is connected to a power source.
How to install a new copy of macOS Catalina in Recovery Mode
Recovery Mode is the special salvation of the Mac that first launched with OS X 10.7 Lion. It creates a temporary boot partition that allows you to access certain things on your computer that you might not be able to if your system froze or crashed. It is the easiest way to install a fresh copy of an operating system.
Connect your Mac to the internet via Wi-Fi or Ethernet
Click on the Apple icon in the upper left corner of your screen.
Select Restart from the drop-down menu.
Hold down Command and R (⌘ + R) at the same time. When you hear the startup chime (or when the screen goes black on newer Macs), keep holding the keys until your computer reboots.
Click on Reinstall a new copy of macOS.
Click Continue.
Click Continue again when the installer window appears.
Agree to the software terms and conditions.
Select your hard drive.
Click Install.
Complete the installation process.
How to update to Catalina after reinstalling an earlier macOS
When you install the latest operating system from Recovery Mode, sometimes, your Mac will install an older operating system, like High Sierra or Mojave. Once the older operating system installation is complete, you can then download Catalina as a software update.
Remember, you must have an internet connection in order to download a fresh copy of the Mac operating system.
Open System Preferences.
Click on Software Updates.
Click on Update Now.
Any questions?
Install Latest Fuse For Mac Catalina Version
Do you need help reinstalling macOS Mojave on your Mac? Post your questions in the comments and I'll do my best to help troubleshoot your issue.
Updated September 2019: Updated for the public launch of macOS Catalina.
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