The "for all users" checkbox you refer to only applies to the launcher, which is why it is immediately alongside the option to install the launcher (and above the comment about the launcher).

The "Install for all users" option on the final page is for the Python runtime (and if selected, also the launcher).

So the only duplication is the "launcher for all users" checkbox on the front page, and that's there so that people who use the default options are able to easily disable it if they don't have administrative privileges. (Also, everything on the front page is a duplicate of something else :) )

I'd happily accept an alternative design for the launcher options if it doesn't involve making the window larger and only uses checkboxes (we have fairly limited UI options available in this installer framework). Or maybe there's a simple text update we can make?