I would like to dig-up this old thread again. I tried to find new information what really happend, but I couldn't find much. Maybe one of our French members can help out?
Here's an online article about this... you can use deepl for example to translate it:
Please note: Once payment is made you need to send a private message to wicked at the forum, stating your username and the email address you used to pay. If you do not do this your upgrade will be delayed, the upgrade will be done within 12 hrs.