From the product website :
You can download and use all amCharts products for free. The only limitation of the free version is that a small link to this web site will be displayed in the top left corner of your charts. If you would like to use charts without this link, or you appreciate the software and would like to support its creators, please purchase a commercial license.
So you need to purchase a commercial license …
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solved How to remove the web address from graph in HTML [closed]