Fixed

• An update that quits and never installs no longer fails silently. The install waiter's detached PowerShell process could die before running a single line of its own script — event-log evidence on a real machine showed it starting the same second the app called app.quit() and never getting further, consistent with Windows Job Object cleanup catching a "detached" child that never requested breakaway. The waiter now writes a heartbeat as its first act, and the app waits (up to 3s) to see it before tearing anything down. A waiter that never signals costs nothing — no daemon shutdown, no quit, no install — instead of the app disappearing into an unexplainable hang. (#1057)

• A failed update now says what happened, where you can see it. The refused-install notice carries the installer's actual refusal reason and stays on screen instead of fading after five seconds; install errors on macOS that landed minutes after the click (staging and handoff deadlines) are no longer silently dropped; and after a failed install the "Install now" button comes back instead of leaving nowhere to retry from. When an update left the installation itself broken, the stale "try again" toast no longer contradicts the boot notice that says to reinstall — including on the first boot after the reinstall it asked for. (#1058)

• Clicking Install can no longer quit wmux into a silent no-op. On current Windows builds the helper process that runs the installer after wmux quits could die before executing a single line, leaving the old version in place with no error and no trace anywhere. The helper's launch is now verified before wmux commits to quitting — if it cannot be proven to run, the update is refused on the spot with the app still open — and a helper that dies partway through now leaves a note that wmux shows on the next start. (#1059)

What's Changed

• fix(updater)：confirm the waiter actually started before quitting by @p-poppe in https://github.com/openwong2kim/wmux/pull/1057 • fix(updater)：surface install failures where the user can actually see them by @openwong2kim in https://github.com/openwong2kim/wmux/pull/1058 • fix(updater)：make the install waiter's launch provable, and survivable by @openwong2kim in https://github.com/openwong2kim/wmux/pull/1059 • chore(release)：3.48.1 by @openwong2kim in https://github.com/openwong2kim/wmux/pull/1061

Full Changelog：https://github.com/openwong2kim/wmux/compare/v3.48.0...v3.48.1