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16 wrz 2024 · Use the bootable installer. Download a full macOS installer from Apple. To get a full macOS installer, download macOS from the App Store or your web browser using the links provided here: How to download and install macOS. Download from a Mac that is compatible with the macOS you're downloading.
9 wrz 2021 · We understand that you're not able to install macOS Catalina using a USB stick. Take a look at the steps in the following guide on creating a bootable installer: How to create a bootable installer for macOS. See if those steps help to get macOS Catalina reinstalled. Keep us posted. Take care.
3 paź 2024 · The message might say that an error occurred while downloading, preparing, or installing, or that the software is damaged, could not be verified, or failed to personalize. The cause of messages like these can vary, and sometimes they're only temporary. Try these solutions. Check storage space
12 maj 2020 · I followed the instructions from the Apple support site to erase the disk using Disk Utility directly after boot and then proceeded to install Catalina. It gets to about 2% left to complete and gives the error: "An error occurred validating the installer data. The download is either damaged or incomplete."
9 paź 2019 · Reddit. Last updated 4 years ago. If you have more than one Mac you want to upgrade to macOS 10.15 Catalina but don't want to waste so much bandwidth downloading it for each machine, one option...
15 lip 2020 · Bootable USB installers offer an easy way to upgrade multiple Macs to macOS Catalina, to perform clean installs of MacOS Catalina, to perform maintenance from a boot disk like formatting disks, modifying disk partitions, and performing restorations, and much more.
16 wrz 2024 · Download macOS via the App Store or a web browser. If you can't do that because your Mac can't start up from its built-in startup disk, you can install macOS from macOS Recovery instead. When the installer asks you to choose where to install, select your external storage device before continuing.
