As announced back in 2011, we are no longer supporting version 2.5.9 of our OS X software products.
Mac users will need to purchase the latest version to update their software to 3.0.x of our products via Apple's Mac App Store app. If you already own version 2.7.1 then it's a free update. Version 3.0.x requires Snow Leopard or higher.
As always, a free 30-day trial copy of our software can be downloaded from our web site if you need or want to try before you buy.