Make sure you install the SF2 DLC using Vita3K. I then opened the DLC folder (\ux0\addcont\PCSE00050\ZENPINBALL2SSFT1) and grabbed the StreetFighter2.pxp from it and moved it to my quickbms folder. I used the latest version of the script that I could find. The exact command I entered in command prompt was:
quickbms zen_studios_pxp.bms StreetFighter2.pxp SF2
That created a new folder SF2 with all of the contents. Then I just replaced the GFX folder in the original download here with what it extracted.