I have CERN Lightweight account but

I cant download fluka
401 - Unauthorized
There was an error loading the page you requested: https://flukafiles.web.cern.ch/flukafiles/fluka-4-0.0/fluka-4-0.0.Linux-gfor9.x86_64.rpm — Access is denied due to invalid credentials. You do not have permission to view this directory or page using the credentials that you supplied.

It’s not enough to have a CERN lightweight account (this is Step 1 in the registration instructions), you also need to register and accept the licence (Step 2 in the same webpage). We cannot see any registration request in your name.
Note that the latter needs then to be approved, which may require some time.

Thank you I was not know about this info