When installing an extension or a package to a virtual machine, creating a new virtual machine, or opening an existing one you may encounter VirtualBox Error VERR_ALREADY_EXISTS.

Huzzah. How to install the extension pack for VirtualBox 7.0 To fix this issue, you must first download the extension pack. There is only one file for this and it works for all platforms.

Learn how to fix VirtualBox Installation failed error, Fatal error during installation by following the suggestions laid down in this post.