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You will still need to convert this APP file to a DMG and then convert it from a DMG to an ISO in order to be able to install it in VirtualBox.Īn easier but also less secure option is to search for an ISO of your desired version of macOS online. Regardless of the macOS version your Mac is running, open the App Store page of the latest macOS version – Monterey – and download the installer from there. Even if you have access to a Mac, you won’t be able to download a copy of the OS you already have installed. Getting hold of an ISO is actually more difficult than you might expect. You’ll also need an ISO image of the macOS version you want to install. First, you’ll need to download a copy of Oracle VM VirtualBox.
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