If you have a spare hard drive lying around, you could use the existing recovery partition to install the OS on to that, even if just temporarily. If you have a friend with a Mac, he could download ...
macOS Monterey (version 12) is a stable, lightweight release that works great on older Macs, including models going back to 2015. The latest version is macOS 12.7.6, and you can download it directly ...
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