If you have v1.00 or v1.06:
→ You have a mod installed. Uninstall it (verify game files in Steam) to return to official v1.08. street fighter x tekken pc version v108 patch new
The "deep text" of this patch involves significant mechanical shifts: If you have v1
For PC players specifically, this patch is essential because it is the version required for: street fighter x tekken pc version v108 patch new