Please check the System Requirements for your product(s) to find the latest information on the operating systems that are supported. 

Windows 8.1 (64-bit) released by Microsoft on October 17, 2013 is compatible with:
  • The Raiser's Edge version 7.93.5782, Patch 4 and higher (SQL Server)
  • The Financial Edge/The Education Edge version 7.87 and higher