CREATE AN INSTALLER PACKAGE FOR MAC HOW TO

Use instructions on the Apple website How to get old versions of macOS to download InstallMacOSX.dmg. The following steps can be used to create a USB installer for El Capitan.

Catalina on a iMac 2013 21.5' for use in a VirtualBox virtual machine on the same Mac.Mojave on a Mac mini 2018 for use in a VirtualBox virtual machine on a iMac 2013 21.5'.Catalina on a MacBook Pro 2017 touchbar for use on iMac 2009 24”.This method was verified by using the following configurations. If you are trying to create a USB installation flash drive of use on another Mac computer, then you can still use the downloaded file to create this installer. This version of OS X 10.11 cannot be installed on this computer.

CREATE AN INSTALLER PACKAGE FOR MAC INSTALL

However, if the model Mac is too new to allow the installation for El Capitan, then message given below will occur when trying to create the Install OS X El Capitan application. There is a link on the Apple website How to get old versions of macOS that will download a file that can be used to create the Install OS X El Capitan application. Note: This answer was adapted from Klanomath's answer to a sightly different question. The second alternative answer involves using an older Mac capable of running Snow Leopard (OS X 10.6). Still, I would like know from Apple why they thought such a complex procedure is necessary. So, Apple evidently intends for users of newer model Intel Macs to use this new answer to retrieve the Install OS X El Capitan application. This answer is must less of a hack, because Apple explicitly inserted code into the El Capitan installer to bypass the checking of the model when executed in a 'VMware Fusion Player' virtual machine. The first alternative answer involves using a virtual machine. I have posted two alternative answers to this question. Justin reported this answer still works for Yosemite. At best, these instructions are just a hack and Apple has every right to change the InstallMacOSX.dmg file to prevent the desired results. These instructions may work as expected, if you are using an older saved version of this file. I have noticed that these instructions no longer work as expected when using the current InstallMacOSX.dmg file, which can be downloaded from either the Apple website How to get old versions of macOS or the Apple website How to create a bootable installer for macOS.

Create an installer package for mac