I'm preparing my next trip and this morning, I went to:
Map manager
Buy maps
Online traffic information
Europe Traffic Information
I bought it and now, going to the same menu, I see a big green "Subscribed" on that item.
Nevertheless, when I go to:
Tools
HD Traffic
Navigator still tells me that HD traffic is only available if I buy it.
By chance, I had to restart Navigator and now this does show "No Traffic information available..." (probably because I did not create an itinerary yet).
I think that upon buying the HD traffic, you should reset a status in your software or inform the end user that this will be taken into account at the next restart of Navigator.
Other GPS apps relying on Tomtom HD Traffic stays on the E25 as only an exit on the E25 is blocked while the E25 is not affected (even traffic is ok at the time of the screenshot).