For me any attempts to use Contour provider for Umbraco Courier end up with following error:

System.Exception: Unable to load one or more of the types in assembly 'Contour.Addons.CourierSupport, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. Exceptions were thrown:
System.IO.FileNotFoundException: Could not load file or assembly 'Umbraco.Courier.Core, Version=1.0.4162.25784, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'Umbraco.Courier.Core, Version=1.0.4162.25784, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'Umbraco.Courier.UI, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'Umbraco.Courier.Core, Version=1.0.4162.25784, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'Umbraco.Courier.Core, Version=1.0.4162.25784, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'Umbraco.Courier.Core, Version=1.0.4162.25784, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
at umbraco.BusinessLogic.Utils.TypeFinder.FindClassesMarkedWithAttribute(Assembly assembly, Type attribute)
at umbraco.BusinessLogic.Utils.TypeFinder.FindClassesMarkedWithAttribute(Type attribute)
at umbraco.macro.GetXsltExtensionsImpl()
at umbraco.macro.b__4()
at umbraco.cms.businesslogic.cache.Cache.GetCacheItem[TT](String cacheKey, Object syncLock, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, CacheDependency cacheDependency, TimeSpan timeout, GetCacheItemDelegate`1 getCacheItem)
at umbraco.macro.GetXsltExtensions()
at umbraco.macro.AddMacroXsltExtensions()
at umbraco.presentation.webservices.codeEditorSave.SaveXslt(String fileName, String oldName, String fileContents, Boolean ignoreDebugging)

I got source code and attempt to rebuild project from scratch - same result on rebuild.

Looks like some DLL's missing or it uses some version which is out of touch with Umbraco...

Any ideas how to fix it, since idea is pretty good to use Courier to move contour forms via service instead of impoprting/exporting those manually..