Fixes auto-update install failing with Cross-device link (os error 18) (EXDEV). The updater extracted to the system temp (/var/folders) and renamed over the app; when the app and temp are on different volumes that rename fails, so downloads succeeded but never installed. The installer now runs on the app's own volume, emits progress, and relaunches. It also detects App Translocation and tells you to move the app to /Applications.
Reproduced on a separate volume and verified fixed (0.9.6 → 0.9.7 installed OK). Update log (Settings → Updates) shows every step.