Starting with ESD #4, Adaptive Server Enterprise ADO.NET Data Provider has only two provider assembly files that each contain all functionality.
Sybase.AdoNet2.AseClient.dll – supports features of .NET 2.0, .NET 3.0, and .NET 3.5.
Sybase.AdoNet4.AseClient.dll – supports features of .NET 4.1, and later.
The 32-bit versions of these files are installed in the C:\Sybase\DataAccess\ADONET\dll directory and the 64-bit versions are installed in the C:\Sybase\DataAccess64\ADONET\dll directory.
Update any build or deployment scripts that reference any of the DLLs that have been obsoleted.