I can’t help locate or provide downloads for copyrighted fonts. If you need a similar free Arabic typeface or legal alternatives to Helvetica Neue Lt Arabic, here are lawful options:
is a high-quality, open-source "sans-serif" Arabic alternative. Further Exploration Learn about the design philosophy Helvetica Neue Lt Arabic Family Free Download
Because it is a premium font, the most reliable way to obtain it is through official font foundries and subscription services: Linotype / MyFonts I can’t help locate or provide downloads for