Product Feature: Installation / Upgrade
Dataflow server v6.8.8 is not supported on Windows 8.1. However, clients of 6.8.8 and few later patch sets are supported on Windows 8.1. Refer attached readme of patch 6.8.8 for more information. To know the supported platforms for a particular patch, refer patch readme shipped with the patch release.
UPDATED: April 24, 2017