SSIS C# script is not compatible

Question

I\'ve recently taken over a SSIS ETL based process and due to some licencing issues I had to upgraded from Data Tools 2013 to 2015. Most of the project survived the upgrade and

Answer 1

If you change Target Server Version for the project, as described in the other answers, make sure to check that you've done so for the applicable configuration(s) that you are deploying (Development, Test, Production).