A tool that searches Appstore for missing macOSes.

Every year when the new macOS is released, the older ones get missing in Appstore. This tool is developed to resolve that issue. Here's an app that communicates with Appstore and allows you to download your desired macOS. For optimal results, run the app in OS X Yosemite.

In order to download successfully, you must be running a macOS version that is lower than the one you wish to download. Eg: If you wish to download Sierra, then you should be running El Capitan or below. Otherwise, Appstore will cease the download. This is a restriction from Apple to prevent us from downgrading.

Enjoyyyyy :)
Is it really as easy as the steps outlined above... [►source]