I just installed the latest version of Octopus Deploy (Octopus.3.2.14-x64).
I note that the installation wizard was very different from the one which you have documented in the installation instructions. I wasn’t asked to set up the admin password as part of the install process.
I followed the instructions here:
to reset the admin password and I am now up and running.
So either I’m missing something obvious or you need to update your documentation.