Apple released macOS Mojave public beta. The official version won't be available until this fall. If you cannot wait to try out new features on Mojave (Dark Mode, screenshot tool, Stacks), download Mojave public beta right now.
Here is how to upgrade to Mojave and what to do if your Mac says there is not enough space to install Mojave. And if you don't like the new macOS, you can downgrade from Mojave to older macOS any time.
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Before we go through the steps to upgrade macOS to Mojave public beta, you should know that a public beta is not finished software so it may have bugs. You are not recommended to install the Mojave public beta on your primary Mac.
Step 1 Check Mojave Compatible Devices
macOS 10.14 Mojave is compatible with the following iMac/MacBook:
MacBook (Early 2015 or newer)
MacBook Air (Mid 2012 or newer)
MacBook Pro (Mid 2012 or newer)
Mac mini (Late 2012 or newer)
iMac (Late 2012 or newer)
iMac Pro (2017)
Mac Pro (Late 2013, plus mid-2010 and mid-2012 models with recommended Metal-capable GPU)
Step 2 Enroll and Download the macOS Mojave Public Beta
To get the Mojave public beta, you need to enroll your Mac in Apple Beta Software Program.
Go to https://beta.apple.com/, click Sign up and sign in with Apple ID and password used by your Mac.
Click Enroll Your Mac > Download macOS Mojave public beta access utility.
Open the utility to download the installer. When the installer is downloaded, it will automatically call up the Mac App Store and display macOS Mojave public beta. Click Download to get the beta.
When the Mojave beta is downloaded, your Mac will restart automatically.
Step 3 Install macOS Mojave Public Beta
After the Mac restarts, macOS Mojave installer will launch automatically. Follow the installer to install macOS Mojave beta.
The installer will first ask you to back up your Mac. Back up as it asks in case something may go wrong in the installation.
Click Agree to accept the terms and conditions of macOS Mojave public beta.
Select the drive you want to install Mojave on. Then click Install > Restart. The mac will restart with macOS Mojave installed.
It is easy to install Mojave, however, macOS Mojave installation could go wrong sometimes. For example, Mojave download failed, the installation got frozen or the Mac said there is not enough space to install Mojave.
Sufficient free space is required to guarantee a successful macOS installation. If there is low disk space on your MacBook, you should clean your Mac to free up more space before installing Mojave.
It is not easy to locate useless files and remove them one by one. You can use a Mac cleaner like FonePaw MacMaster, which can scan out all the files that can be safely removed on your Mac on one click, including:
Large old files;
System files that are safe to delete, like cache, log files;
Unused applications and related app data;
Extension that you don't need anymore.
Just download the Mac cleaner, choose a data type and let the cleaner to scan out unnecessary files. All you have to do is click the Clean button to free up space.
Some users reported that after updating to Mojave, files on their MacBook or iMac are gone. If you have encountered a similar situation, don't worry, try the following methods to get back the missing files after Mojave update.
First, check iCloud Drive. If you have turned on iCloud Drive and turn off Desktop & Documents Folders, your files will stay in iCloud Drive and a new folder, that's why it looks like all your files are gone. So go to System Preferences > iCloud > iCloud Drive > Options and deselect Desktop & Documents Folders.
Next, if you have created a Time Machine backup before Mojave update, restore the missing files or all files from a Time Machine backup.
Finally, if you don't have any backup, you can use a third-party data recovery solution - FonePaw Mac Data Recovery, which can recover deleted photos, videos, audio, documents, emails from Mac computer without backup. macOS 10.14 Mojave is supported.
Step 1. Download FonePaw Mac Data Recovery and run it on your Mac.
Step 2. Click Mac Data Recovery, select the files you want to recover and select the drive. Click Scan.
Step 3. After the application scan out the missing files, click Recover to get them back.
If macOS Mojave causes problems on your Mac, for example, battery drains more quickly, apps frequently freeze, you can delete Mojave and go back to High Sierra. Here we will show you how to erase Mojave and downgrade to High Sierra or older.
Before heading to anything, make a full backup of your Mac to ensure the safety of data on your Mac.
Step 1 Erase macOS Mojave Public Beta
Click Apple icon and select Restart. Then press Command + R as the Mac reboots, which will enter your Mac into recovery mode.
Click Disk Utility > Startup Disk > Erase. Enter the name of the file you want to erase, like macOS Mojave.
On the Format column, select Mac OS Extended (Journaled) if your Mac is using HFS+ and APFS if Select GUID Partition Map and click Erase. Quit Disk Utility after macOS Mojave is deleted.
Step 2 Reinstall macOS High Sierra
If your Mac came with macOS High Sierra, just restart your Mac while holding down Shift-Option-Command-R. After the Mac restarts, it will downgrade to macOS High Sierra.
But if your Mac came with an older version of macOS, you need to reinstall High Sierra. Here is how to clean install macOS High Sierra.
Any question about macOS Mojave? Leave your question below.