Typically, when users download and/or upgrade to a new version or macOS (previously Mac OS X), via the Mac App Store, that version of the installer appears in the Purchased tab of the App Store app.
Below is an example of how this appears (I've added arrows to highlight the macOS installations):
However, users are reporting that they do not see the macOS Sierra installer in their list of purchased items. Signing out and back into the App Store does not resolve this issue.
Questions
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How do users get their previously downloaded macOS Sierra installation to appear in the list?
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How can users ensure that macOS Sierra (or later versions of macOS) are available to them when newer versions of macOS are released?
Best Answer
Contrary to past OS releases where the N-1 installer is removed soon after version N launches, Apple has an article with links to the store and detailed requirements for getting and installing macOS Sierra (even after High Sierra is out).
I would use the help article HT20802 to check for an updated link if the Mac App Store one fails you. As soon as you get Sierra installed, I would make a bootable USB drive for your personal rescue kit - especially if macOS Recovery isn't available for your hardware or typical network situation.