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Do change the language close the game, open "ZED Online Updater.exe" choose the languages you would like to install, click on start download. After installation the game should start automatically. Select your desired language in the options menu and click on "Save options". Notice that now all elements have a translations. Certain UI elements may stay in English.
Cut Scenes
To install the cutscenes open "ZED Online Updater.exe" select fullmotion cinema and start the download. After installation go into the options menu to select the cutscenes you would like to see.