Lync 2013 in Office 2013 Click-To-Run installation
Open an Office application, such as Word, and then select File > Account > Update Options > Update Now. If "Update Options" does not appear on the client, this is an MSI installation.
Don’t see your Lync client in this article? Click here for a complete list of clients. Click-to-Run is the recommended method to install the Lync client. See the benefits of using Click-to-Run. You can download the Click-to-Run Lync client from the Office 365 Portal.