This error message appears because the certificate that the installer is using is not being allowed by the macOS. 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. In this case, however, since the certificate is being blocked, the installer throws the said error message as a result. Now, there are quite a few workarounds to this problem. The first would be to just simply allow the certificate from the security and privacy settings. However, there are some issues with doing that if you are remotely connected to the system. Nonetheless, we will go through all the possible scenarios and provide a workaround. So, without further ado, let us get started.
Method 1: Allow the Certificate
The first thing that you should do when you face the said error message is to allow the certificate from the system preferences. As it turns out, the certificate isn’t allowed by default and thus awaits approval under Security and Privacy in the System Preferences. Therefore, you will have to do allow it from there. However, it is important to note that if you are remotely connected to the system, this might not work for you. Therefore, we have other workarounds that you can use to fix the issue. With that said, follow the instructions down below to resolve the issue:
Method 2: Allow Unidentified Developer Apps
Another way you can fix the said error message is to allow unidentified developer apps on your Mac. What this will do is it will essentially allow applications from unidentified developers to be opened. Now, this isn’t something that you should do normally but in this case, it can be an exception. It is also important to note that you will have to disable this once you have installed VirtualBox on your system. Follow the instructions down below to do so: Once you have successfully installed VirtualBox, you will have to disable this setting. To do this, follow the instructions below:
Method 3: Execute a Script
As we have mentioned before, for some people, clicking the Allow button in the first method might not work. This especially happens to those who are not locally present in front of their Mac and are remotely connected/sharing a screen. In such a case, what you can do is execute a script that tells the Mac to click the Allow button. In order for this to work, you have to make sure you do not move the Security and Privacy window. This is really important. With that said, follow the steps down below to create and execute the script:
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