Re-configuring from scratch while error in site upgradation 8.0

Hi Team,

I was working on the onsite upgrade process from 7.16 (dev local instance and Postgre as DB) to 8.0 by following this documentation and with proper files. But I got few errors and I need to configure everything from scratch as told by Support team.

So can someone please refer or help me in figuring out the steps which I need to take in consideration to achieve this task.

Thanks in advance