Don't have Telegram yet? Try it now!
https://veenstra.me.uk/2014/09/26/sharepoint-2013-system-io-filenotfoundexception-could-not-load-file-or-assembly-microsoft-sharepoint-client-workflowservices-version15-0-0-0-cultureneutral-publickeytoken71e9bce111e9429c/
SharePoint 2013 - System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.SharePoint.Client.WorkflowServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies