PSA: for MOST use cases there is now a much easier solution. If your primary goal is just to download updates faster/not use up your limited data budget, and you have multiple Macs (otherwise why do ...

macOS Monterey version 12 is a stable, lightweight upgrade that works great on older Macs, and you can use the direct DMG or ISO links to download, install, upgrade, or downgrade your system easily.

Macworld advises that older, unsupported Macs can run newer macOS versions like Sequoia and Tahoe using the OpenCore Legacy Patcher tool. This process carries significant risks including stability ...