Oracle VirtualBox, compatible with multiple platforms, can be obtained from https://www.virtualbox.org/wiki/Downloads. It is also recommended that you download and install the corresponding extension pack, as it provides USB 2.0 and 3.0 support, RDP, disk encryption, and several interesting features.

From the Kali downloads page, choose your preferred version. As mentioned earlier, we will use the Xfce4 64-bits ISO (https://www.kali.org/downloads/). You can choose any other version according to your hardware or preference, as the installed tools or the access to them will not be different for different versions—unless you pick a Light version that only includes the operating system and a small set of tools.