It turned out that in case of a reboot all files are copied properly, but a configured self-registration does not take place -- not during installation, and not after the reboot.
I have checked the setup.ilg file and it tells me no news: files are copied, and self-registration appears to have been done.
When I close programs to prevent the necessity of a reboot or when I install the first time everything is ok. Registration is also ok when I re-run the setup with the repair function.
I have similar setups with no issues of that kind. I just can't find the difference that prevents self-registration.
Can you explain why the self-registration does not happen and what I can do to make it happen? Thank you!