Seems to be a general problem with brand new Dell hardware. I'm typing this on a brand-new Inspiron which similarly refuses to update to version 2004. Thing is, I reinstalled Windows from scratch to get rid of the Dell bloatware, so I know that it's not something weird or special about my Windows installation. It's the same version that I installed on my NUC which upgraded fine to 2004. The only thing added after install and before the attempt to upgrade was the Dell hardware drivers, which, I suspect, are the real culprit here -- likely Dell hasn't yet delivered 2004 versions of those to Microsoft.