'Install MacOS Mojave.app': The last complete installation file is the only one that contains the createinstallmedia tool to create a start-up disc for Mojave MacOS. In case you're asking yourself what this patch is good for, the Mojave DosDude patch allows you to install Mojave MacOS on officially incompatible Mac hardware, however this is not. How to Downgrade Back to High Sierra from MOJAVE will not let you down and do what this program was made to do. All features are included and described in notes.txt file after download and installation. How to Downgrade Back to High Sierra from MOJAVE has WINDOWS, MAC OS X, and Latest mobile platforms supported. We are adapting our tools to new.
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.
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.
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.
Select Restart from the drop-down menu.
Click Continue.
Complete the installation process.
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.
Click on Software Updates.
Click on Update Now.
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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macOS Mojave is here and by now you may have installed it and started playing with some of its new features, like the new Continuity Camera that lets you use your iPhone as a scanner on your Mac, or the new Gallery view in Finder, or maybe the new screenshot tools.
However, it’s also possible, given that macOS Mojave is a very new release and still being fine tuned by Apple, that you’ve run into problems and need to reinstall. Thankfully, that’s very easy to do. Before we get to that, however, it’s worth eliminating one other possible cause of the problems you may be experiencing.
When you install an OS on top of another OS, and then do the same the following year when the next version comes out, your Mac accumulates lots and lots of files that it doesn’t need. These are added when applications are installed, when they’re run, and when applications like Photos, Safari, and iTunes are used. Over time these junk files can hamper the performance of your Mac. The solution is to give your Mac a cleanup. We recommend CleanMyMac X. It scans your Mac for junk files and recommends to delete them safely. It can claw back tens of gigabytes of disk space, and improve your Mac’s performance. Give it a go, you can download it for free here, and see how much disk space it can give you back.
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.
Whichever of the two options you choose, you should back up your Mac first. If you use Time Machine to backup to an external disk or a network drive, you can restore all your applications and settings from that backup after you reinstall macOS Mojave. If you plan to run a clean reinstallation, that’s definitely the simplest route. If you prefer not to use Time Machine, you can use any other backup application, or clone your entire disk.

If you’re reinstalling because you’re going to sell or give away your Mac, you should sign out of iCloud, iTunes, and iMessage first, then run a clean installation.
Once you’ve backed up your Mac, you’re ready to begin the reinstallation process.
The simplest way to install macOS Mojave, and the method that Apple recommends, is to go to the App Store, find Mojave in the Quick Links section on the right hand side of the front page, click it and then follow the instructions to download and install it.
If you’re having trouble with the App Store, or you need to run a clean install, you can do the following.
1. Restart your Mac using one of the following keyboard commands:
2. When the macOS window appears, if you’re not performing a clean installation, skip to step 7.
3. Click on Disk Utilities and choose the Erase tab.
4. Give your disk a name, choose APFS or Mac OS Extended (Journaled), and if Scheme is available, set it to GUID Partition Map.
5. Press Erase.
6. When it’s finished, quit Disk Utility to go back to macOS Utilities.
7. Choose Reinstall macOS.
8. Click Continue and follow the instructions. You’ll be asked to choose the disk you want to install macOS Mojave on, if you down’t see your startup disk, select Show All Disks.
9. Select Install and wait for the installation to complete and your Mac to restart.
If you ran a clean installation, you’ll be taken to the Setup Assistant to go through the process of reconfiguring your Mac. If you made a Time Machine backup before reinstalling, make sure it’s connected.
During setup, you’ll be asked if you want to transfer data from another Mac or a backup. Choose that option then navigate to the Time Machine backup to restore data. You’ll be given the option to transfer any or all of: Applications; user accounts; other files and folders; and computer and network settings. Choose the option you want and press Continue.
If you don’t transfer data during setup, you can do it at any time using Migration Assistant in Applications>Utilities.
Reinstalling macOS Mojave is very easy. Just make sure you backup your Mac first and download CleanMyMac X(free version) to give it a good clean up!