I downloaded the iso and booted it up. The issue did not trigger, I got the graphical session just like usual. So the fault cannot be with the iso on the web page... Also, you got the checksum right, so it should not be possible for it to be about the download process either. So, that only leaves the possibility of faulty iso burning process (which is also weird, because xfce iso works for you).
Maybe try burning with etcher? Also, if you want bspwm edition, you can install it from the xfce iso just as well. It's only installable with manjaro-architect anyway, so you can just install it, test it, and reinstall something else if it doesn't suit your needs.