WeOnlyDo.Client.SFTP.Core.dll adding issue in .net core (wodSFTP / wodSFTP.NET / wodSFTPdll)

Trying add in a class library project.
In old version project we used 'WeOnlyDo.Client.SFTP.dll'.
When I tried to add this DLL in my .net core project getting error while establish connection.
'Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. The system cannot find the file specified.'

But in the new version with new dll for core, initialization itself blocking.