If you are a student practicing at home, use the free trial or save up. If you are a professional, buy the license. It costs less than a dinner for two and pays for itself on the first project. If you genuinely have no budget, skip the illegal downloads and learn Observable Plot or RAWGraphs (free web apps) instead.
FF Chartwell is a and is not officially available for free download. It is an innovative typeface designed by Travis Kochel that uses OpenType ligatures to automatically transform text strings (like "10+20+70") into editable charts and graphs. Where to Legally Obtain FF Chartwell Ff Chartwell Font Family Free Download