![]() ![]() These download to your Applications folder as an app named Install macOS. Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra. ![]() A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan.A USB flash drive or other secondary volume, formatted as Mac OS Extended, with at least 12GB of available storage.What you need to create a bootable installer Some early betas can only run on specific Mac hardware. You also need to make sure that whatever beta your using can run on the model of that CPU. Install Mac OS X 10.5 Leopard via USB on PowerPC Macs (youtube) And if your iBook is the same, not working with the above USB method then you may need to try the Open Firmware approach to boot from USB: Install OSX 10.5 Leopard on Powerbook G4 (a1138) with a USB drive! WITH 10.5 LEOPARD IMAGE. Using Classic mode on a Power Mac G3 or better, it is still possible to run many applications compiled for the original 680×0-based Macs as far back as the 1980s. On PowerPC machines, Tiger is the last version of OS X that supports Classic mode, the built-in virtualizer for Mac OS 9 applications. ![]()
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