A few days ago, HCL Sametime and HCL Sametime Premium 12.0.1 were released. The installation is basically the same as for version 12.0, but I modified my guide.
The upgrade is also very simple, so you can check out the guide I prepared.
So you can get started.
You can also use the docker-compose.override.yml file… see my article: https://www.angioni.nl/2022/11/21/use-docker-compose-override-yml-for-customizing-your-sametime-v12-docker-configuration/
You also need to backup your ssl certificate in the sametime-config folder.
I would strongly suggest to start the upgrade process with a backup of the existing installation directory before you unzip the zip file (not just before running install.sh). Otherwise you’ll overwrite your existing docker-compose.yml file that may contain custom settings.
https://help.hcltechsw.com/sametime/1201/admin/upgrade_install_fixpack_docker.html
Thank you for the heads-up. I’ve added a note.