How to get old version Obsidian from GitHub?

[ariehen]

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Which Mac OS is required for Obsidian

All the older Obsidian versions are here: You didn’t say what macOS version(s) your older machines are running, so we can’t really direct you to the last installer of Obsidian that can be installed on them. Once the older installer is, uh, installed, you can update within Obsidian if it’s not too old.