Latest update for WCF RIA Services v 1.0 includes support for Windows 8.1 and VS2010, 2012, 2013.
Version: 4.1.61829.0 | Date Published: 11/5/2013
Little about WCF RIA Services
“ WCF RIA Services simplifies the traditional n-tier application pattern by bringing together the ASP.NET and Silverlight platforms. RIA Services provides a pattern to write application logic that runs on the mid-tier and controls access to data for queries, changes and custom operations. It also provides end-to-end support for common tasks such as data validation, authentication and roles by integrating with Silverlight components on the client and ASP.NET on the mid-tier. “
[Quote – Microsoft]
Download WCF RIA Services v1.0 SP2