Then, you advise me to not install the new beta version because my site is active
That is correct but it’s totally up to you.
only for new installations?
I would say that this is also correct but again it’s up to you.
The beta version is for users who have staging sites or localhost sites that don’t mind encountering a few bugs.
If you don’t want to risk anything, then it might be good to wait until the official release.
Let me know if this is clear 🙂