Yes, we have a new version of the Avaya VPN client after quite a wait. The new client adds Windows 8.1 support as well as not dying now if you connect to a remote computer using Windows User Fast Switch as long as your using the same credentials in the tunnel as the remote PC. No Windows XP support any longer. Vista, Windows 7 and Windows 8/8.1 from here on out.
Readme is below:
https://downloads.avaya.com/css/P8/documents/100181760