Versions of .NET

Release 4.5.1

  • Released on 2013-10-17
  • CLR Version 4
  • Included in Windows 8.1
  • Installable on Windows Vista SP2, 7 SP1, 8
  • Included in Windows Server 2012 R2
  • Installable on Windows Server 2008 SP2, 2008 R2 SP1, 2012
  • New features

Release notes

(Source)