You can install the most recent version of a Web module.
If the portlet.xml file of the updated portlet contains new values for administrable portlet properties, such as configuration settings or language-specific titles, these become effective only if the respective property has not been changed after the portlet was initially deployed. For example, the value that was modified by using the Manage portlets portlet or in the Configure mode of the portlet will override the value from portlet.xml.