Still error

The plugin’s idea is nice. However, even I’ve followed ALL the instructions the API Key is not working. It’s giving this error:
REQUEST_DENIED: This IP, site or mobile application is not authorized to use this API key. Request received from IP address 185.98.X.XXX, with empty referer.

I have lost lots of hours trying different ways… I checked this link, it also was insuccessful: https://www.ads-software.com/support/topic/request_denied-this-ip-site-or-mobile-application-is-not-authorized-1?replies=7