AppleInsider

How to create a bootable macOS Catalina installer on a USB drive

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 is to create a bootable installer on a ...
Ars Technica

How to make your own bootable macOS 10.15 Catalina USB install drive

PSA: for MOST use cases there is now a much easier solution. If your primary goal is just to download updates faster/not use up your limited data budget, and you have multiple Macs (otherwise why do ...
Macworld

Installing macOS or OS X: What to do when ‘the installer payload failed signature check’ or ‘this copy of the install OS X application cannot be verified’

The other day a co-worker needed to borrow a Mac, so I grabbed an older MacBook Air from storage. I decided to wipe out the laptop’s flash storage and install a fresh version of OS X. I created a ...
TechRepublic

How to create a bootable USB installer drive for macOS

How to create a bootable USB installer drive for macOS Your email has been sent Your new Mac doesn't include an installation media. With the help of a GUI, Jack ...