The are new versions of fldigi, flmsg and flrig software. The current updates were released on Jan 31, 2019 and show version 4.1.00 for fldigi. The newest versions (as always) can be downloaded at W1HKJ's website.
Fldigi along with flmsg and flrig (for CAT control of your radio) are used almost exclusively during emergency communication deployments. It's best to keep them updated to the latest version to prevent problems or compatibility issued in a real event.
All three can be used on Windows, Linux and MacOS platforms, making it very easy to use.