Deepl plugin not working

Hello everybody,

I am aware that there is a similar case that has been posted recently, but my situation is a bit different.

I have purchased a Deepl API key, but I have never managed to make it work. What I get is the following message:

Neither the SDL nor the Deepl supports are able to help. 

Here is what I have done so fare:

- reset my Studio 2017 profile.

- uninstalled and reinstalled the Deepl plugin

- attempted to whitelist the plugin in my Windows Firewall, but when it comes to creating an exception for it, I cannot locate the plugin file on the machine.

Unfortunately I am not an IT expert, so I am probably doing something wrong or missing something out.

Anyone had a similar problem? Thank you.