Hello,
I found out why it was not displaying the version to be installed.
You have to click on "install" in order to see the version getting installed, then you select that and click "OK" to start the installation.
But as a cautious person, not willing to de facto factory reset the device, I hesitated. Nowhere was it mentioned that there would be another page, where further settings could be made.
I feel kind of silly for this, but at the same time it seems like an oversight in the Installer, that you cannot see how many option pages there will be before you actually commit on installing anything.