All these indicators must be green for the upgrade to work. Otherwise, the upgrade button will not appear.
When your store is hosted on your local server (
Start your Upgrade
This section compares your version of PrestaShop with the latest stable one. You can quickly see whether you need to update or not. If you know that there is a newer version available than the one presented, you can trigger a version check by clicking the "Check if new version available" button.