Good evening Jacqueline and welcome to the Events Calendar Support forum!
Thank you for reaching out to us in spite of language challenges.
I would offer to continue the conversation in French, but I do not think that would help.
I would love to help you with this topic.
I can see that your purchase of the 59$ the Events Calendar Pro upgrade to business was successful.
This means that you can now use the same license key you had before on 2 additional sites.
Let me know if that helps.
Have a great day!
Geoff B.