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Open the preferences window ("Window –> Preferences")
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Select "Maven / User Settings" (1)
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In the ‘Global Settings’ field, select the settings.xml file stored in
${MODELIO_INSTALL}/bundle/maven/conf/settings.xml. (2)
where${MODELIO_INSTALL}is the full Modelio installation path. - 
Click on the "Update Settings" button in order to apply the new Maven configuration. (3)
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Click on the "Apply" button. (4)