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What a Sirio release is on each platform, and how to build from source before 0.6.0 ships.

Binaries ship with 0.6.0. Until then, build from source.

What a release is

Platform Artifact Install
macOS (Apple Silicon) Sirio-<version>.dmg, signed and notarized Drag Sirio.app to Applications
Windows (x86_64) SirioSetup-<version>.exe, per-user Inno Setup installer Run it; installs to %LOCALAPPDATA%\Programs\Sirio with a Start Menu entry
Linux (x86_64) Sirio-<version>-x86_64.AppImage chmod +x, run from anywhere

The Windows installer and the Linux AppImage ship both binaries, sirio (the app) and sirioctl (the control-socket CLI), side by side. On macOS the app links the first sirioctl it finds, next to itself or on your PATH, into ~/.local/share/Sirio/bin/sirioctl the first time it launches an agent, so hooks receive an absolute path whatever the shell’s PATH says. Intel Macs and ARM builds of Windows and Linux are not part of the release matrix.

Updates

Release builds check a signed channel manifest, download the next artifact, verify its Ed25519 signature and apply it in place. The swap never targets a running binary. A quiet indicator in the status bar says when a version is ready. See Updates and channels.