Could you please confirm—do we just need to download the new Mattermost version and point it to the old data file path, or is there anything else required?
You can follow the tutorial. There is no need to point to the old data file path. In the tutorial in step 6 they mention cd {install-path} . in our case on a debian server the location is /opt/mattermost, so do the find command from the /opt folder.