Thank you for your response Mahmoud.
Unfortunately I lost the situation, and I was able to proceed couple of days later. I don't know what changed. The latest problem was that I could not read the license text (no permission to read the file, or the file did not exist), but I was able to accept it. Now the STM32CubeIDE seem to work.
So, I think there still is some problem with the registration process that may affect some people.
Vesa
