Hello
There has been an update patch to V13 that is now available for download.It is a full new install. You must uninstall your current V13 and install the new V13 to take advantage of all of the new updates. The Help>Check For Updates option is not valid for this large patch.
Please remember before downloading and installing to backup any files that you may have customized. Please see this document as a resource to help you: https://www.cadsoft.com/learning-center/support-learning/installation/saving-before-uninstalling/
When you start Envisioneer, in the “Newsfeed” area there is a direct link to download the newest version.
Enjoy!