Hello rodrigoechaide,
This page contains information about the upgrade process:
https://openvpn.net/vpn-server-resource ... r-updated/
From experience I would say there's like a 99% chance that when you run those commands, things are upgraded without you having to do anything else. But there's the 1% chance that you have some legacy setting that might need manual adjustment or that the upgrade steps bring in operating system patches that could probably do with a reboot of the system to complete fully (like kernel upgrades) or some other unexpected issue.
I would recommend that you follow our guide which specifies backup steps as the first step. So you have a way back if you run into trouble and need to do a rollback and/or wait for assistance on how to resolve your specific issue, should anything untoward happen. And to of course plan this at a quiet moment for you.
But again, 99% of cases, you just do that upgrade as you said, and everything upgrades, and you're fine. Particularly the licensing is something we test for with every release to ensure it stays functional. If your licensing is subscription, there's practically no risk, since that's not tied to anything and will just work on as many servers as you like, even different or new ones. And tiered instances on AWS, which are licensed through AWS, are also fine. That is tied to the instance product information which doesn't change when you change software on your AWS instance, and works with any version of Access Server 2.* automatically. And fixed license keys will also continue to function normally on an AWS EC2 instance if you upgrade/downgrade/rollback the software of Access Server on it. It's only when you make a new instance on AWS EC2 or launch a new instance from a (backup) AMI that you may run the risk of losing a license. But not when you just upgrade software in the OS.
I also want to point out that the latest version is 2.8.8. The latest version available on the Amazon AWS marketplace at the moment starts out as 2.8.5. But those, and any Access Servers out there, can be upgraded using apt-get update/upgrade to latest version 2.8.8. We periodically update the starting images on Amazon AWS marketplace. But the latest updates can always be obtained through the upgrade steps.
Kind regards,
Johan