Known Installation Issues Incompatible Applications macOS has an Incompatible Software folder which is used to keep software that might not work correctly with the version of macOS you have installed. Empty the Trash, and then restart your Mac. We have created two videos that show the installation steps. Either watch the videos, or follow the steps below. The default layout shows the preview pane to the right of the message list. Classic Layout Solution. Be sure you are in classic view mode by going to Mail Preferences Viewing. Be sure the box next to 'Use Classic Layout' is checked. Click and drag up on the bottom edge of the Apple Mail window to view the message preview pane.
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Do you find macOS Mojave a bit too much and therefore want to downgrade? Is your Mac a bit slow or are you having problems with your apps? Or are you having some issues with your current macOS? Reinstalling macOS is often the last resort for fixing software issues on Mac.
Swift mac app example. This article will show the step-by-step process of how to clean install macOS on your Mac. Whether you need to download and clean install High Sierra, Sierra, El Capitan, Yosemite, or an earlier version of OS X, this guide got you covered. We’ll start by showing you how to clean install macOS Mojave, the latest version of macOS, before moving on the more complicated business of installing an earlier version of macOS or OS X.
What You Will Need
To reinstall macOS, you need a removable flash drive with at least 15GB of free storage to make a bootable USB on Mac. This is where you’ll save the installer file for your preferred version of macOS. Make sure that there is no important data on the drive because we’re going to erase it for this purpose.
Another thing you need to take care of before reinstalling your macOS is your backup. In case something goes wrong, at least you saved your important data. When backing up your files, clean out your junk first by using an app such as Tweakbit MacRepair. It deletes all the unnecessary files so you don’t have to carry them over to your freshly installed macOS.
To create a backup of your data using Time Machine, follow these steps:
- Connect an external hard disk to your Mac using a USB cable, FireWire or Thunderbolt cable.
- Click the Apple icon located in the top left corner of your screen.
- Choose System Preferences > Time Machine.
- Turn on Time Machine by moving the slider to On.
- Click Select Backup Disk and choose the external drive you want to use for your backup.
- The external drive will be formatted, and the backup process will start in a few minutes.
Downloading and reinstalling your macOS is a simple process, but take note that every time you make important changes to your Mac, you risk problems that may cause you to lose your data. So before you do anything else, make sure your data is secured. It’s better to be safe than sorry.
Once you have your USB drive and backup taken care of, then you’re ready to clean install your new macOS.
Step 1: Format the USB drive.
You need to re-download the installer file for your chosen macOS and save it on your USB flash drive. So the first thing you need to do is format the drive as a Mac OS Extended (Journaled) volume with a GUID Partition Table. Make sure there are no important files or data on the drive because everything will be erased.
To format your drive, follow these steps:
- Head to Applications > Utilities > Disk Utility.
- Choose your USB drive and click Erase.
- Rename your USB Drive to Untitled.
- Choose Mac OS Extended (Journaled) as the format type. For Macs running High Sierra or Mojave, choose APFS from the options.
- Select GUID Partition Map under the Scheme options.
- Click Erase. This may take a couple of minutes, depending on how big your flash storage is.
- Click Done.
Step 2: Re-download your chosen macOS installer file.
If you’re re-installing Mojave, all you need to do is search for it at the Mac App Store. Just click Download or Get, depending on the Mac App Store version you are using. If you get a warning message saying that this version of macOS is already installed on your computer and asking whether you want to continue, just hit Continue. Type in your Apple ID and password to proceed. The installer is a big file, so downloading it might take some time. macOS Mojave, for instance, is around 5.7GB.
Once the installer file has finished downloading, it will automatically launch. We don’t want it to run yet, so hit Command + Q to quit the installer.
Getting the installer file for older versions of macOS requires more work because Apple doesn’t offer downloads of old macOS versions on the Mac App Store, even if you search for them.
If you’re running macOS Mojave, you won’t be able to find older versions of macOS on your App Store no matter what you do. You need to find a computer running an older version of macOS and download the installer file from there. You can find the older macOS and OS X versions under the Purchased tab of the Mac App Store. You’ll be able to download these versions of macOS and OS X from here: https://cititree.weebly.com/python-get-running-mac-apps-site-stackoverflowcom.html.
- OS X El Capitan
- OS X Yosemite
- OS X Mavericks
- OS X Mountain Lion
- OS X Lion
You’ll notice that Sierra and High Sierra are not included in this list, and that’s because Apple removed Sierra from the Purchased list when it introduced High Sierra in 2017. Fortunately, you can still download Sierra from this link as long as you’re using a non-Mojave Mac.
If you want to download High Sierra, you’ll have to download it from another computer that’s running an older version of macOS and copy it from there.
Step 3: Create a bootable USB on Mac.
![How To Reinstall Preview App On Mac How To Reinstall Preview App On Mac](/uploads/1/3/3/9/133946344/594425577.png)
The next step is to create a bootable USB disk that you will use to install a fresh copy of your macOS. You need to install macOS from USB, so you need to create a bootable drive, using the Terminal.
To make a bootable macOS install drive, follow these instructions:
- Launch Terminal by pressing Command + Space and typing Terminal in Spotlight. Or you can go to Finder > Go > Utilities > Terminal.
- Connect the formatted USB drive to your computer. Make sure the name of the drive is ‘Untitled’ for this to work. Rename the drive if necessary.
- Copy and paste this command into the Terminal:
sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled — /Applications/Install macOS Mojave.app
- Hit Return.
- Type in your password.
- This process can take a while, so be patient. When you see the word Done, this means that the bootable drive has been created.
Step 4: Install macOS from USB.
Now that your installer is ready, it’s time to install a fresh copy of your chosen macOS, using your installer drive. Follow these steps to reinstall macOS from your USB drive:
Connect your bootable drive to your Mac, then turn on your Mac or restart while holding down the Alt or Option button. This will open up the Startup Manager.
Choose to install your macOS from the external drive.
Click Disk Utility, choose your Mac’s hard drive, then hit Erase.
Go back to Startup Manager and click Install macOS.
This process will install your chosen macOS on your computer. Take note that all apps and data will be deleted from your Mac, so make sure that you have a backup of your files. The installation might take some time, so just wait. Op z mac app.
How To Reinstall Preview App On Mac Catalina
Once the installation is finished, you can restore your apps, files and settings from your backup. Or if you want everything to be as good as new, download your apps again manually. This is recommended if you were having issues with your apps in your previous macOS.
If you’re running into errors and your system is suspiciously slow, your computer needs some maintenance work. Download Outbyte PC Repair for Windows, Outbyte Antivirus for Windows, or Outbyte MacRepair for macOS to resolve common computer performance issues. Fix computer troubles by downloading the compatible tool for your device.
See more information about Outbyte and uninstall instructions. Please review EULA and Privacy Policy.
See more information about Outbyte and uninstall instructions. Please review EULA and Privacy Policy.
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.
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
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.
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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.
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Other ways to install macOS
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- 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.