To do this, open up the System Preferences through the Apple menu.If you are able to boot into macOS, you can easily change the date and time through the System Preferences window.Once you have made sure that you do not have an active connection, follow the steps given down below: This is because if you are connected to the internet, the date and time will just revert and you won’t be able to achieve what you want to. ![]() It is important to note that when you change your date, please make sure that your Mac device does not have an active internet connection. We will go through both of them, so just follow through. In case you can’t, don’t worry as you can still achieve through the macOS Recovery menu. First, if you are able to boot into your current version of macOS, you can just go to the System Preferences and do it from there. Now, there are two ways that you can do this. That way, the certificate will still be valid and you will be able to complete the installation. As it turns out, you will have to change your date and time to the time when you actually downloaded the installer. The first thing that you should do when you face the error message is to change your date and time. Method 1: Change Date and Time Through Terminal With the causes of the error message now out of the way, we can get into the different methods that you can implement to install OS X El Capitan successfully. As a result, you will have you redownload the installer to fix this issue. In case the download process was interrupted or interfered with, it may result in the said error message.
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