No internet connection is needed to use the software.
The only time an internet connection is needed is when you activate your software. If you do not have an internet connection available on the computer where Version 6 is installed, then you can use the form at http://licensing.mackichan.com/Activate from another computer. Use the computer ID from the computer where Version 6 is installed.
If you have the What's New side panel open, Version 6 will attempt an internet connection to refresh its content. If you have a strong firewall or no internet connection, a message containing "the operation timed out when attempting to contact www.mackichan.com” can appear. You can disable this by closing the What's New side panel using the Close item from the Actions menu.