That path is not making sense to me. It looks like you are not extracting the plugin’s contents into a Plugins folder.
This is a plugin and, in Unreal, plugins go into a Plugins folder, inside your project folder. Try this:
- Create a new project from the Launcher. Let’s say you call it ArduinoTest.
- After the project is created and opened once, close it and open its folder, where the .uproject file resides.
- Create a new folder and name it Plugins.
- Extract the zip content into the Plugins folder.
- Launch the project again, go to Edit > Plugins, on the left scroll to Project Plugins and enable UE4Duino there. Then restart the project.
With this structure, the Intermediate folder path should be something like …\ArduinoTest\Plugins\UE4Duino\Intermediate.