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1. Download the Highcharts zip file here (bottom of page).
2. Unzip the file on your computer.
3. Create the folder “/wp-content/plugins/highcharts-js” on your server.
4. In the unzipped file there is a folder “code”. Take the file “highcharts.js” from it and upload to the folder that you just created on your server.
5. Enable the option in the plugin settings screen.