For example, to look at the version for the Sierra installer: New in macOS Sierra and up (at the time of writing, High Sierra beta 4), there’s an ist file located alongside the InstallESD.dmg image in the SharedSupport directory, which seems to contain this info. I also often find myself looking at an installer app on some system, somewhere, and I just want to know what version it is. The CDN propogation delays for the installers seem to have improved recently, but generally one still always wants to confirm that they’ve downloaded a newly-released version. There’s no obvious way to tell, just from looking at the installer app, what OS version you’ve actually downloaded if you’re getting it right at the time of release (or ever, for that matter). It’s often happened that CDNs take up to a few hours to offer the newer macOS installer, even when the App Store HTML tends to update to the latest version immediately after Apple releases the updates to their Software Update catalogs. The 2nd component in the version info above happened to match the minor OS version in later Sierra installers, but not this one. 'Get Info' dialog for the Sierra 10.12.3 installer.
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