You need the font family, specifically the Roman (Regular) and Bold weights, from a source that is:
Font Squirrel is one of the few third-party font sites that Google Chrome fully trusts. They have a strict “100% free for commercial use” and malware-free policy. descargar fuente montserrat roman bold chrome verified
Ideal para títulos, titulares de alto impacto, botones de llamada a la acción (CTA) y elementos que necesitan jerarquía visual. You need the font family, specifically the Roman