Unfortunately our current Melodyne version 4.2.2 has an error which, in certain constellations, when the application starts, displays a “version is expired” message and quits again. We are truly sorry that we missed this bug. In any case you should replace your current Melodyne installation with the newest version 4.2.3, which we have uploaded. You can find the installer in your user account: https://services.celemony.com/cgi-bin/WebObjects/LicenseApp The good news: documents you have