Enable debug logs, restart mediacenter (Exit in Power menu), retry the installation. Upload logs via MyOSMC or “grab-logs -A” in command prompt. Provide the URL given, here.
Edit: Did a clean install and had to manually install all the required addons for netflix addon, check this post:
But i got problems getting it to work, had to downgrade the script.module.request to get it working. Did get the script.module.requests-2.18.4.1.zip (which didn’t work, script.module.requests-2.18.4.zip did).
Got a working Netflix add-on, on a fresh install