Rhonda: If you are getting the FULL version of Yulelog on the 2017 CD, then yes, uninstall BOTH the 2013 and the 2017 version you have already installed. If the 2017 CD is the UPDATE only, then you need to uninstall the 2017 you have already installed because you need a FULL version already installed if you add an UPDATE. (However, I would recommend uninstalling the 2013 version even if it is the FULL version, and reinstalling it, then installing the 2017 version if it is the UPDATE only.)
Ted