Note - the .p12 certificate is currently not available. I will update this page when I have more info.
Download the .p12 format certificate. Make sure that it is called cacert.p12 - not cacert.htm or cacert.p12.htm. If you have file endings hidden this may happen. If the icon looks like an Internet Explorer one then the file has the wrong name. Choose Tools > Options then the content tab:


Choose the Import button to start the Certificate Import Wizard then follow this series of dialogs: Step 1:

Step 2:

Step 3 (no password entry is required - leave all fields blank): 

Step 5:

Then a security warning will appear - select yes:
Finally - you can see the certificate installed: 