Different API Error

The attempt to reach the jsDelivr API server failed with the following error: http_request_failed: cURL error 7: Failed to connect to api.jsdelivr.com port 80: Connection refused (URL: http://api.jsdelivr.com/v1/jsdelivr/libraries/fontawesome/?fields=versions,lastversion)

I cannot deactivate or uninstall the plugin. Please let me know what this means and what to do. I just bought the Lightfast theme and for this theme it’s compulsary to use Advanced Custom Fields: Font Awesome.

Thanks