Keep in mind that some of these links or tools might not be up-to-date or supported by Capcom. Be cautious when downloading or using third-party patches.
Some users reported that Patch 1.02 (not 108 specifically, but close!) or later versions unlock all characters. You can try updating your game to the latest version. street fighter x tekken pc patch 108 character unlock link
Here are some useful posts and links that might help: Keep in mind that some of these links
You're looking for a PC patch to unlock all 108 characters in Street Fighter X Tekken! street fighter x tekken pc patch 108 character unlock link