his release is primarily a stabilization release, with lots of adjustments aimed at refining functionality in the ATutor 2.0 series. For those using the ATutor 1.6 series or earlier, you should upgrade as soon as possible to take advantage of many new features and a number of security enhancements. For those using 2.0 or later, you might choose to upgrade if you are experiencing any problems with your current installation. Otherwise 2.0 users might choose to wait until the next release to upgrade.