Apple moving older macOS installers from the Mac App Store
Apple has started making the following macOS installers available outside of the Mac App Store (MAS).
For each listed OS installer, Apple has direct download links via their relevant KBase article for InstallOS.dmg or InstallMacOSX.dmg disk images.
In turn, these disk images contain installers named InstallOS.pkg or InstallMacOSX.pkg.
These installers do not themselves install the relevant version of macOS or OS X. Instead, they install the Install.app for that macOS or OS X version into the /Applications directory.
Once the relevant Install macOS or OS X app is available, it can be used to install that OS.
The installers for the following macOS versions are still available via the MAS.
They can also be downloaded on macOS Catalina using the softwareupdate tool.
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Der Flounder 
Hello Mr Trouton, I have no success at making createinstallmedia from this Sierra version (after certificate apocalypse). Did you run into this problem as well? All other re-released version work fine for me. Thank you
try using DiskMaker X or try using Install Disk Creator. both worked fine for me with these version to make new USB bootable Sierra and El Captain installers.
Also, if you follow this post here, its all you need to do to get your previous installers working again:
https://discussions.apple.com/thread/7675283