I have downloaded our new licenses for 2010, however when I went to add the licenses, iManager told me they were already installed.

I found TID 7000769 in knowledgebase that says the licenses first need to be removed before the new ones can be added, however, it does not say what will happen between the time the licenses are removed and new ones installed. Should this be done after hours? I do not want to have all my users lose connectivity to the server because I delete the licenses.