Is there a product key for Endnote installation?
Answer
There is no product key for the NU version of EndNote, nor can you upgrade to the NU version from a trial version. If prompted for a product key, stop the installation, return to the zipped file (likely in your Downloads folder) and closely follow the instructions under "Download and Install" on the Service Management Portal page for Endnote. If you have installed the trial version, you will need to uninstall it and then reinstall.