I really don't know which problems you might have.
Perhaps you tell a little bit more:
- Which version of macOS you have?
- Which version of OpenCPN
- Which version of oesenc_plugin you have?
- Is the plugin shown in settings plugins?
- Have you actvated it?
- Instead of searching the web have you ever read the manual?
Actually it should be:
- OpenCPN v5.0.1 download as: http://download.opencpn.org/5.0.1/Op....1+0266678.dmg