With that said, follow the instructions down below to resolve the issue: Therefore, we have other workarounds that you can use to fix the issue. However, it is important to note that if you are remotely connected to the system, this might not work for you. Therefore, you will have to do allow it from there. As it turns out, the certificate isn’t allowed by default and thus awaits approval under Security and Privacy in the System Preferences. The first thing that you should do when you face the said error message is to allow the certificate from the system preferences. So, without further ado, let us get started. Nonetheless, we will go through all the possible scenarios and provide a workaround. However, there are some issues with doing that if you are remotely connected to the system. The first would be to just simply allow the certificate from the security and privacy settings. Now, there are quite a few workarounds to this problem. In this case, however, since the certificate is being blocked, the installer throws the said error message as a result. The VirtualBox installer is actually signed using the Oracle America certificate which needs to be allowed in order for the installer to proceed with the installation. This error message appears because the certificate that the installer is using is not being allowed by the macOS. As it turns out, some users face the “ The installation failed” error message while trying to install VirtualBox on their Mac system.

In some cases, however, the installation procedure may not go as expected.

VirtualBox is one of the most famous hypervisors out there which is available for all the different platforms. Having the ability to use a completely different system on top of your existing is something that the common folk wouldn’t even imagine a while back. The popularity of virtual machines grows day by day and for good reason.

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