GANT is always being improved so you will want to be sure you always have the latest version. You may manually check if your version is up-to-date by selecting "Check for Updates" from the "About" menu:
You will see a window appear similar to this:
If your version of GANT is up-to-date, then it will tell you that you have the most current version available. If you do not, then simply click "Download" to update to the latest version.
To ensure you are always aware of the latest updates, keep the "Check for updates when program starts" checked.