If you previously downloaded Sierra, you can find it in your → Purchased tab. If not, Apple still provides old macOS versions hidden in their support system: 👉 Apple’s official Sierra download link (redirects to App Store if available).
—are you setting up a virtual machine or creating a bootable installer for an older Mac? mac os sierra 10.12 6 iso download
Apple still hosts the macOS Sierra installer on its servers for users with older hardware. Official Link: You can download the macOS Sierra 10.12 installer through the Apple Support website Browser Requirement: If you previously downloaded Sierra, you can find