AutoCAD 2020 was released at the end of March 2019. Per Autodesk T&C’s they support the current version and three back. Therefore, AutoCAD 2016 is now an unsupported version.
We encourage our customers who are using Construct 12 or below to consider upgrading to Construct 13 with a supported AutoCAD version.
Construct 12 currently requires AutoCAD 2016
Construct 13 currently requires AutoCAD 2018
Construct 14 (will release mid-year 2020) will require AutoCAD 2020
If you are currently using AutoCAD 2016 on prem there are no issues (besides support) in continuing to use this version. If you are a subscription customer, you can continue to renew with AutoCAD 2016 as well. You will not be able to add additional licenses of an unsupported version or renew an unsupported version if the subscription lapses.