Join arranger keyboard forums (like SynthZone or Arranger World). Many members own legitimate copies of older Style Works versions. They often offer a "conversion service" for free—you email them the style, they convert it and send it back.
Check old software resellers, eBay, or the official EMC website (if still active). A legitimate license typically costs between $80 and $120. For that price, you get: Style Works Xt Universal 4.50 Free Download -UPD-
Recommendation: Do not download “Style Works Xt 4.50 free” from unknown sources. Join arranger keyboard forums (like SynthZone or Arranger