I just updated a V4 with RPi4 from PT Stage 8.2.2 to 8.3.1 without issue. No problems with the install. It played fine after reboot and I can remove and add PT chain.
It works for me!
To complement with some findings from trial and error.
-I was not hearing anything when updating from the licensed user page dowload (I did not completed the autorization process)
- It started working back after updating with the trial version archive.
I wrongly assumed that the download from the user account with registered licence would work in trial mode if no licence was provided.