On Tue, Aug 27, 2019, 7:07 PM Robert P. J. Day <rpjday@crashcourse.ca> wrote:

  what is the *proper* ISO to install that will eventually get me to
fedora 31? thanks.

Hello.
I think you should look here:
https://kojipkgs.fedoraproject.org/compose/branched/

Check the STATUS file to see if the building is still in progress.

Then for workstation, assuming that the building was successful, you should find the ISO here:
https://kojipkgs.fedoraproject.org/compose/branched/latest-Fedora-31/compose/Workstation/x86_64/iso/


Ciao,
A.