The release of Couchbase .NET SDK version 1.3.9 is a minor update featuring a single patch, reflecting a shift in focus towards the upcoming .NET SDK 2.0 Beta, which emphasizes eliminating major bugs, improving documentation, and developing new example applications. Users can access the updated binaries on S3 or install them via NuGet by using the NuGet Package Manager Console. For any issues or installation problems, users are encouraged to provide feedback through various channels, including a Q&A forum, creating an NCBC in Jira for bugs or features, or contacting the developer on Twitter.