Hello.

I've installed macOS Sierra Beta, but having some problems with not updated yet programs and I'd really like to revert back to El Capitan.
So, I'm trying to make a Clean Install following this tutorial.
http://osxdaily.com/2015/10/01/clean-install-os-x-el-capitan-mac/
I downloaded El Capitan, made my bootable USB, rebooted then selected Install El Capitan.
Apple logo appears, a bar starts progress, but then, white text like Blue Screen of Death appears on the back, saying Thread 0 crashed, and the message
"Your computer restarted because of a problem" appears and it restarts on macOS Sierra.
I've not found anywhere anybody having same issue, so i'm asking here.

Would somebody know how to fix this?
Thanks in advance.

Crash logs: