How to install a macOS 26 Tahoe virtual machine in macOS 15 Sequoia, with links to the software you’ll need.
virtualisation
How apps and processes set their priority, and on Apple silicon that determines which type of core they can be run on. What you can do to alter that.
In a VM hosted on an M4, upgrading 14.7.5 to 15.4.1 took an 8.7 GB download and worked. From 15.1 to 15.4.1 took over 15 GB and failed with a kernel panic.
Is it possible to update a VM running macOS Sequoia to version 15.4? Three attempts, three failures. And why are all those file creation dates wrong?
Your Mac unexpectedly restarts, and a little after logging in you see a Panic Alert. Before sending that to Apple, save a copy and follow this guidance, including how to read a panic log.
Running older macOS, support for Intel apps and kernel extensions, booting from an external drive, Boot Camp and Windows support, cloning, and startup key combinations.
How to create and set up macOS VMs for virtualisers. The structure of a VM, creation and first run explained. How to enhance it, and how to run it in isolation.
Which versions of macOS can run in a VM? Can they run Intel apps too, and Intel macOS? How well do they perform? Can they access iCloud and run App Store apps?
Which versions of macOS can you ‘dual boot’, should you install them all on the internal SSD, or is a bootable external disk better, and when would you need to virtualise?
From the start of the fourth cycle in M4 Macs and the smallest ever, through the omission in macOS VMs, and QuickLook shortcomings, to the stealth firmware update.
The Eclectic Light Company 