Hi,
Sorry for the issues you are having. I can help resolve this with you.
Please note the license keys are not needed for the plugin to work, they are only needed for automatic updates.
To get some information about the issue can you please try downloading this simple plugin called Validate URL:
https://www.dropbox.com/s/nyugz86o4401ayg/validate-url-.7.zip?dl=0
After Activating go to Tools > Validate URL
Enter in these two urls:
https://theeventscalendar.com
https://tri.be/
As well as these two IP addresses:
https://162.243.159.176
https://50.116.28.27
And let me know the response code you get.
If none of those are able to connect it means the site is blocked from accessing our servers and you would have to whitelist those ip addresses or check the connection if no sites are accessible such as https://google.com from the validator url check.
Let me know what you find out.
Thanks