First for Win10. My personal advice is to uninstall F-secure. Windows Defender is definitely good enough these days. So keep that.
F-secure is also known to block OpenCPN
without reason and despite attempts to convince them on there false positive.
Win Defender does warn about about non Microsoft files like OpenCPN but you can convince Windows to use it. See my shots. On the first click "more info" and accept to proceed. If you get the second click "run anyway". You'll get another warning where you've to answer "Yes".
In case you (by mistake?) have set Windows to block all external program go to "Windows defender security
center" -> "App and browser control" and select "Warn" or less.
To be able to use oeSENC chart you must install the plugin.