Older versions of macOS used an “–applicationpath” flag in this command, but this is now deprecated and will cause an error if used.I wouldn’t bother with it personally, but feel free. This is presumably helpful for faster or offline installations, though I haven’t noticed any difference. It downloads assets which may be required during installation. The “–downloadassets” flag was introduced with macOS Mojave.If you want to be asked for confirmation before erasing the drive, remove “–nointeraction” from the command.Sudo /Applications/Install\ macOS\ Catalina\ Public\ Beta.app/Contents/Resources/createinstallmedia -volume /Volumes/USB -nointeractionīe sure to update the command based on what the installer is called, and not just blindly use the command above for all situations. For example, if the installer is called Install macOS Catalina Public Beta, you would use this command instead: If you are creating an install USB from a Beta version of Catalina, you’ll need to update the command to list the correct name of the installer in your Applications folder. Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/USB -nointeraction This will wipe the drive completely.ĥ) Now open up Terminal and paste in this command: Don’t rename the file or move it out of /Applications.ģ) Format your >8GB drive to GUID Partition Map and Mac OS Extended (Journaled) this can be done from the Disk Utility application. Quit it, open your /Applications folder and find the installer there. Once installed on your computer, it will begin downloading the Public Beta.Ģ) Once the download is finished, your Mac will launch the installer app. You will then be provided with a different version of the Beta Access Utility. Other users can join the Public Beta for free. Once installed on your computer, it will begin downloading the Developer Beta. Paid developers can download the Beta Access Utility from the Apple Developer portal downloads section. If you want to download a Beta version instead, the process is slightly different: How to create a macOS Catalina installerġ) Download the Install macOS Catalina application from the Mac App Store. A USB thumb drive is usually best for this, but you could also use an SD card or an external hard drive partition. To get started you’ll need the Install macOS Catalina application and an external storage drive larger than 8GB. Having an install drive allows for deployment to multiple computers without re-downloading, performing clean installs, and booting to the installer’s built-in recovery tools for troubleshooting. This guide will show you how to make an install drive from the macOS Catalina 10.15 application.
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