macOS El Capitan: No packages were eligible to install. How to fix. Internet Recovery.

How to successfully install macOS El Capitan with Internet Recovery mode, avoiding the error caused by a built-in expiry date. You can start from having the "no packages were eligible" error on screen and still recover, which saves you having to DOWNLOAD the installer all over again. Updated version.
Fixes the "install failed" and "No packages were eligible for install" error while installing macOS El Capitan with Internet Recovery by setting the date back to the year 2015 with a quick Terminal command. PLEASE HAVE A BACKUP BEFORE FOLLOWING THIS PROCEDURE.
Even better, if your Mac is currently functional and you have an external USB device to use as an installer, you can use this alternate method without needing to fool your computer about what year it is: One of our viewers (Clinton W Salvato) said "I was able to confirm that Apple has re-issued their installers with new certs: People can get a fresh copy of El Capitan here: support.apple.... It will bring down the OSInstall dmg. Simply run the installer.pkg and it will create the installer App in /Applications. Then create boot media as normal, or run the installer as usual to upgrade the machine." I now have a video walking you through this procedure: • Install El Capitan via...