The authentic family is a commercial font, an intellectual property asset of Linotype / Monotype. Using unlicensed copies is illegal software piracy and can lead to severe penalties. Always check the licensing information. Legitimate sources will clearly state the terms:

Frustrated, Omar leaned back and typed the phrase that every desperate designer knows by heart: "Helvetica Neue Lt Arabic Family Free Download."

The family is meticulously crafted to ensure that bilingual text layouts look balanced and unified.