How to Change User Interface Language? Zortam Mp3 Media Studio › Forums › Zortam Mp3 Media Studio Forum › How to Change User Interface Language? This topic contains 1 reply, has 0 voices, and was last updated by Zortam Support 5 years ago. Author Posts January 2, 2015 at 12:00 AM #525 Zortam SupportKeymaster How can I change the GUI-Language when the application already is installed? I have 2 users on the PC, one prefer english and the other german. Regads Mark Author Posts You must be logged in to reply to this topic.