From the FAQ on their website:
Is the software the same with a Non-Commercial License as with a Commercial License?
Yes. The software is identical. However, the granted rights are different for a Non-Commercial and Commercial license. With a Commercial license, you can use our software in a commercial company or for commercial activity. With a Non-Commercial license, our software cannot be used for commercial activity and you must retain the Highcharts watermark.
You are allowed to distribute a Highsoft software product with non-commercial packages given that you fulfill two conditions:
- Emphasize to your users that Highsoft software products are not free for commercial and governmental use. You can do this on your download page or when your users activate a Highsoft software product in your application.
- Provide a link back to www.highcharts.com in the same location.
May I use your software under the Non-Commercial License for Open Source Projects?
Although Highsoft's software have open source codes, our software is not licensed as an open source software and is unfortunately not compatible with any open source software license like Apache 2 or any GPL. See also Non-Commercial Redistribution above.
IMO (and I'm not a lawyer), as long as you comply with the conditions of the CC license and these conditions you should be OK.
BTW, I'm not so sure Filament Watch is in compliance with the Highchart license.