ok trying that but apparently the latest version does not support High Sierra because I’m getting the verboten symbol over the Obsidian icon. And Releases · obsidianmd/obsidian-releases · GitHub doesn’t indicate which might’ve been the last version to support High Sierra?
Sorry, we do not support Mac OS 10.13.6. It was deprecated by electron a long ago.
As you have discovered, you can try to use an older version of the installer but at some point something is going to break for you.