The plugin stopped working after upgrading Paint.net to v4.3 (and 4.3,.)
C:\Program Files\paint.net\FileTypes\SvgFileType.dll, version 1.0.0.0
Type: System.Web.IHttpAsyncHandler
System.TypeLoadException: Could not load type 'System.Web.IHttpAsyncHandler' from assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.