For some reason I can't even get composer to understand that there are new versions of Magento.
$ composer require magento/product-enterprise-edition=2.4.0 --no-update Could not find a Magento project package matching "magento/product-enterprise-edition 2.4.0" for PHP version 7.3.11 Update of composer.json with Magento Commerce 2.4.0 changes failed, reverting ./composer.json to its original content from before the Magento root update. Magento root updates cannot run without a valid target package [InvalidArgumentException] Could not find a matching version of package magento/product-enterprise-edition. Check the package spelling, your version constraint and that the package is available in a stability which matches your m inimum-stability (stable).
I get the same message if I upgrade to php7.4. I'm kind of at a loss right now as we can no longer update our store.
I was following the instructions outlines here https://devdocs.magento.com/guides/v2.4/comp-mgr/cli/cli-upgrade.html which appear to be the same as the link you provided. Am I to assume I should use step 3 where I just download and extract on top of my local install and hope I don't clobber any of the changes make by my dev team?
Watch video upgrade: https://www.youtube.com/watch?v=1R5TZvpox8U