Some community members have uploaded the patch as a beta branch on Steam. To access this:
Disclaimer: The official Capcom servers for patching are no longer active, so community-led "No-GFWL" patchers are often required. SF x Tekken PC update? - Shoryuken Forums Archive
Ensure the game is run as an administrator to apply the DLC files properly. Summary of Patch 1.08 Changes
This report documents the deployment and content of Patch 1.08 for the PC version of Street Fighter X Tekken . This update primarily focuses on addressing stability issues related to Windows 8/10 compatibility, and correcting several online synchronization errors present in the previous version (1.07).