Patch Notes: The Launcher

The desktop app opens on a launcher

Daggerfall Online now opens on a launcher: the patch notes on the left, your options on the right, and Play at the bottom. Nothing starts until you press Play.
Updates install before you play. When a new version is out, the launcher downloads it, installs it and reopens by itself, so you play on the same version as everyone online. In a hurry? Play without updating, and it installs when you quit.
The patch notes are right there. Versions that arrived since you last played are marked New; one on its way is marked Update.
Your options, beside the notes: your game files (change the folder at any time), your saves folder, the update check (on or off) and Reinstall.
The Windows installer and the Linux AppImage update themselves. The portable exe and the Mac tell you when a new version is out, with a Download button.

A new version that comes out while you play is shown on screen. It installs when you quit, or at once from File > Restart to Update (save first). On a Mac or the portable exe, the File menu's Download gets it.
Closing the window in the middle of a game now asks "Leave the game?", with Stay the default. Before, the window's X, Alt+F4 and File > Quit did nothing while you were in the world.
The app has its own icon.

On first run the launcher looks for Daggerfall itself: Daggerfall Unity's settings, every Steam library, GOG, and a DaggerfallGameFiles.zip unpacked in Downloads, Desktop, Documents or Games. It shows what it finds, and you choose.
Choose the game's folder, not just ARENA2, and it looks inside for you. Steam's "Browse local files" folder works.
A folder is only used when it is whole. A folder missing some of the game's files says which ones.
If the folder you chose before cannot be reached (a drive unplugged, a network share asleep), the launcher says so and offers Try again. It no longer freezes while it waits.
Choose in the game instead is still there, one click away.
On a Mac, the launcher points you to DaggerfallGameFiles.zip. Steam and GOG sell Daggerfall for Windows only.

The download buttons on the website always give you the newest version for your system: the Windows installer, the Windows portable exe, the Mac app and the Linux AppImage.
The app is not code-signed yet. On Windows choose More info, then Run anyway. On a Mac open it once, then choose Open Anyway under System Settings, Privacy & Security.

The install experience: a Warframe-style launcher, update notifications, one-click downloads, releases published whole - audited twice by @Lattymoy in #429

Full Changelog: app-v0.1.4733...app-v0.1.4745