A few weeks ago Esri® released ArcGIS 10.4.1. This newest release was mostly a maintenance and quality improvement release. We are pleased to announce that Lucity version 2016 fully supports ArcGIS version 10.4.1! Older versions of Lucity that fall under active maintenance can be upgraded to 10.4.1, but may require some additional steps as outlined in this knowledge base article. As mentioned in an earlier post, ArcGIS for Server 10.4 is not supported with any Lucity version. If you were considering the upgrade to 10.4, you should instead upgrade to 10.4.1.
Feel free to contact a Lucity support representative for more details, or refer to the Lucity Support Center for updates to our ArcGIS version support.