Hi guys a bit puzzled by the guidance online about this.

so if I read this correctly I can test it myself right?

as per upgrade dot odoo.com - just need to run this command below.

here is what I am getting when running this (odoo-18 is a copy of the DB)

postgres@odoo:~$ python <(curl -s https://upgrade.odoo.com/upgrade) test -d odoo-18 -t 19
2025-09-28 06:53:06 ERROR: Error: Unable to get the subscription code of your database. Your database must be registered to be eligible for an upgrade. See https://www.odoo.com/documentation/user/administration/maintain/on_premise.html for more info. Alternatively, you can specify the subscription code using the `--contract` argument.

it is my small scale test in production environment, and I am willing to try it as is (have backups etc) and definitely not ready to get enterprise support for this one.

Is it actually possible to do upgrade to version 19 by oneself?