I received a link from CS50 Bot to download the CS50 Appliance and after clicking download it asked me to register VMware Fusion. It asks me for the company name, is this where I put John Harvard's details in?
Try to follow this manual (see How to Install Appliance)
How to Install Appliance
In order to install the CS50 Appliance, you first need to install a hypervisor, which is a program that will let you run virtual machines on your own computer, whether you run Mac OS, Windows, or Linux.
If you have a Mac, we recommend that you follow these instructions for VMware Fusion.
If you have a PC running Windows, we recommend that you follow these instructions for VMware Player.
If you have a PC running Linux, we recommend that you follow these instructions for VMware Player.
Alternatively (and particularly if you run into trouble with VMware Fusion or VMware Player), you can follow these instructions for VirtualBox.
Once installed, it’s not uncommon for the appliance to take a minute or so to boot. But if, once at John Harvard’s desktop, the appliance still feels unbearably slow, you might need to enable hardware virtualization on your computer if it’s a PC running Windows or Linux. (Hardware virtualization should be enabled by default on any Intel-based Mac manufactured in the past few years.) Even with hardware virtualization enabled, though, virtual machines might still feel slow if your computer is a few years old, has a CPU that’s only 1GHz or so, or has only 1GB or so of RAM.
see https://manual.cs50.net/appliance/19/#how_to_install_appliance for more details!