I used Rufus https://rufus.akeo.ie/ to create a bootable USB stick of the install image and it worked perfectly.
The only issue I had gettng FreePBX up and running was properly configuring the DNS servers, which I resolved after reading this thread:https://community.freepbx.org/t/freepbx-distro-activation-loops/30381 , although I doubt that misconfigured DNS is the source of your problems.
Try a fresh install using Rufus with the “Create a bootable disk using DD image” option and see what happens…