Can I delete Catalina and re-install Mohave? MacBook Pro
I have an older MacBook Pro and inadvertently updated to Catalina, not realizing that I would lose my entire Word suite. How can I go back? is that even possible
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MacBook Pro 13″, macOS 10.15
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You will need to restore from a backup made before the upgrade. You will need to erase the drive first, reinstall macOS Catalina, then migrate your user account(s) and apps from a backup.
Restore your Mac from a backup - Apple Support
Erase and reformat a storage device in Disk Utility on Mac - Apple Support
How to create a bootable installer for macOS - Apple Support