I seem to have forgotten how to upgrade the program after buying it a few years ago, any advice/link?
Just get it from the “Download” link at the top of the web page, then run the downloaded file from a terminal.
As @ccaudle says, you don’t really “upgrade” an existing installation: you just “side-grade,” installing a new version next to it. E.g.:
$ ls -laF /opt | grep Ardour
drwxr-xr-x 6 root root 4096 Mar 16 2025 Ardour-8.12.0/
-rwxr-xr-x 1 root root 4931 Mar 16 2025 Ardour-8.12.0.uninstall.sh*
drwxr-xr-x 6 root root 4096 Apr 12 23:17 Ardour-9.2.0/
-rwxr-xr-x 1 root root 4930 Apr 12 23:17 Ardour-9.2.0.uninstall.sh*
It might get tricksy to run an older version against a project created by a newer one, but you can keep the old one around to manage legacy / archived projects, while moving on to the new one for greenfield work.
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