Unlike open-source fonts (like Google Fonts) or freeware fonts, corporate typefaces are intellectual property.
Since you cannot legally download the official Adnoc Sans, let’s get you set up with Montserrat (the best alternative). Follow these steps for a free download and installation. Adnoc Sans Font Family Free Download
However, there are legitimate ways to access similar or specific weights for personal or evaluation purposes: Unlike open-source fonts (like Google Fonts) or freeware