Once I was in Mac OS, creating the Mavericks USB installer from Jehos' file was a breeze; so like I said earlier, my ignorance was the culprit and not the files within the zipped up installer/image ...
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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