Downloaded the latest Mac installer (4.9 (build 3819)). First attempt at run failed -- I had to manually create an /Application Support/Subsonic folder, set permissions, and reinstall. Second time it started up fine.
Unfortunately, it looks like the transcoder didn't install (the Subsonic/transcode folder is empty).
I've looked around the forum but cant seem to find a simple answer: can I install it manually? And if so, how?