Many type designers release a "Regular" weight for free as a loss-leader. Check reputable font aggregators like Font Squirrel or Google Fonts (if Protofo has been added to their library) or DaFont (ensure it has a "100% Free" license). Look for the author’s official website.
Have you used Protofo Regular in a project? Drop a link in the comments—I’d love to see how you kerned it. A typography nerd who believes you should never pay for a font until you have tested it for 30 days. protofo regular font free download
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