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Everything Seraph publishes is served from dl.seraph.si. Nothing else is official.
Our domains always end in seraph.si. A launcher from anywhere else is not ours, whatever the file is called.

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The launcher

Windows

Download for Windows x64An installer. Windows may warn about an unrecognised app the first time you run it.

macOS

Download for Apple SiliconA disk image for M1 and later. Intel Macs are not published yet.

Linux

Download for Linux x64An AppImage. Make it executable with chmod +x seraph-launcher.AppImage before running it.

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How the download URLs are built

Every build is published under its own version, so a link never changes what it points at:
The current release is 0.3.0. Alongside each build sits the bundle the updater installs (seraph-launcher.app.tar.gz on macOS) and a .sig file, which is the signature the launcher checks before it installs anything.

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How the launcher updates itself

The launcher reads a manifest for its channel on startup:
It names the newest version, one build per platform, and the signature proving that build came from Seraph’s release pipeline. A build that is not signed by that key is refused, so an update cannot be substituted in transit. You do not need to download the launcher again by hand.
Releases are cut on three channels: stable, beta and alpha. Ordinary installs follow stable.

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How the mod updates

The mod is not something you download. The launcher fetches it for you and installs or injects it each time you launch, so the mod is current whenever the launcher is. While you are in game, Seraph is also told about new releases over its stats socket, and says so in chat once per version:
Restarting through the launcher is all that is needed. Your settings live on your account and in your Seraph folder, so nothing is lost. The versions currently published, per channel, are readable at mod-socket.seraph.si/update if you want to check what you should be running.

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Verifying what you downloaded

1

Check the domain

The address bar must read dl.seraph.si. Not a lookalike, not a mirror, not a shortener.
2

Check the file name

seraph-launcher.exe, seraph-launcher.dmg or seraph-launcher.AppImage. Anything ending in .scr, .bat, .jar or .zip claiming to be the launcher is not.
3

Let it update itself

Once installed, the launcher only ever installs signed builds from its own manifest. Taking updates from it, rather than from a link someone sent you, is the safest route.
See How to stay safe for the full list of official sources.