Upgrade does not finish, keeps looping

Hello,
I am upgrading from 3.4 to 6.0.4, and the process continues well but when I reach the final step where I have to access the setup page, it loops back to the upgrade page.
I cannot access the login page, as the installer keeps looping this migration process over and over again. Please assist.

Regards.

This is sorted. Ensuring the user is added even during upgrade fixes it.