1. Install EPiServer.ConnectForSharePoint.2.3.2 to CMS site.
2. In Admin mode, open the SharePoint settings page.
3. Enter credentials.
4. Click the 'Test connection' button.
---> CURRENT: Error when connecting to SharePoint site: Could not load file or assembly 'Microsoft.SharePoint.Client.Runtime, Version=16.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified.