making Catalina usb device
where do I get the download from
MacBook Pro 15″, macOS 10.13
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You also need the instructions in this Apple article for creating a bootable macOS USB installer (also contains links to various macOS installers):
How to create a bootable installer for macOS - Apple Support
You can only download a macOS 10.15 Catalina installer using a Qualifying Mac. A Qualifying Mac is one which is capable of running macOS 10.15 which is most Macs from 2012 - 2019. You can confirm a Qualifying Mac using the information in this article which shows which hardware is compatible with various versions of macOS.
The Bootable Installer can Only be performed on an Apple Computer
This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of Catalina would have to be done on a computer that Qualifies to run Catalina.
Notation: If the computer being used to perform this action is Too New or Too Old to qualify to run the version of macOS - this computer can not be used.
Alternative is, to gain access to a Qualifying Apple Computer from a family member, friend or associate.
making Catalina usb device