The application has an auto update mechanism. It checks for a new version on launch, and if the new version exists, you'll see the corresponding notification:
Click on this icon to launch Updater tool. It will check your current version and perform necessary actions to update the program to the latest version. Before update starts, it will show full list of changes since installed version until the version being downloaded:
Click theUpdatebutton and wait until the process finishes. If you keep your program up to date, then update process will go quickly, because patches usually take no more than 1 Mb.