Customers need to export current configurations and apply to a new running instance by themselves.
We have a robust solution for upgrading the products by simply running
APT package managers. This solution is only for Varnish Custom Statistics (VCS) and Varnish Enterprise customers.
Varnish Custom Statistics (VCS) and Varnish Enterprise (VE) customers, we encouraged you to register for support and software update at: https://www.varnish-software.com/enable-cloud-subscription/
Once you are registered you will get a mail with instructions how to setup a software repository.