Don't worry, though; if you are still using Traffic Travis v3 (free or Pro versions) and want to continue using it, that's fine, it will still work.
We have decided to focus our development and support on Traffic Travis v4 to make it the best SEO software available.
The good news is if you'd like to use Traffic Travis v4 free version you can download it here.
If you currently have Traffic Travis v3 Pro and would like to upgrade to Traffic Travis v4 Pro you can do so by contacting customer support here.
You can then easily migrate your Traffic Travis v3 projects to Traffic Travis v4 by clicking 'Help > Open TT3 ->TT4 Migration' from within Traffic Travis v4.