I set the license key using Utilities.ApplyLicense() and copied my license key on the required path under licensePath variable.public const string licensePath = "../../../../Data/Storage/GroupDocs.Viewer.lic"
Problem is the output file still shows the "Evaluation version" watermark.
Can you please tell us whether the evaluation version watermark only appears when you upgrade the API to version 16.11.0 or it also appears when you render the document using version 3.0.0? Before rendering the document using each version, please clear the contents of temp folder which will be located in your storage directory. Please try and share the outcomes with us.
I have tested the example project with the latest version of GroupDocs.Viewer for .NET and your provided document is rendering into PDF without any issue. It seems that the issue is with the path to the license file. Please verify that you have provided the correct path of the license file in Utilities.cs class and the license file is physically located in that folder. After verification, please remove the files from temp folder located in storage directory and run the project again. Hope it helps.