No problem 🙂 Your English is better than my Italian 🙂
bbPress includes an Invision importer for forums, topics/threads and replies/posts.
It doesn’t support articles or comments so you would need to use an RSS importer
p.s. You can import the forums after your Invision license expires, it takes the data directly from the database, so any time in the future you choose to import these you can do this easily 🙂