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RELEASE_README.md

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+# PristonTale EU for Linux
+
+Version 0.5.1 installs, updates, repairs, and launches PristonTale EU through a
+native Linux dashboard. Game files come directly from the publisher and are not
+included in this archive.
+
+## Install
+
+Keep the archive and checksum file together, then run:
+
+```text
+sha256sum -c pristontale-eu-linux-installer-v0-5-1.tar.gz.sha256
+tar -xzf pristontale-eu-linux-installer-v0-5-1.tar.gz
+cd pristontale-eu-linux-installer-v0-5-1
+./install.sh
+```
+
+The default installation directory is `~/Games/PristontaleEU`. To use another
+disk or directory:
+
+```text
+./install.sh --install-dir "/path/to/PristontaleEU"
+```
+
+Existing installations at the previous default location are preserved during
+upgrades. The installer adds **PristonTale EU** to the application menu and
+installs the `pristontale-eu` command in `~/.local/bin`.
+
+## Use
+
+Open **PristonTale EU** from the application menu or run:
+
+```text
+pristontale-eu gui
+```
+
+The main launcher button automatically shows **Install**, **Update**, or
+**Play** according to the managed game's state.
+
+Version 0.5.0 is the self-update bootstrap. Future signed launcher releases are
+checked in the background and appear as an **Update Launcher** action. Launcher
+updates are staged separately from game files and retain the previous version
+for rollback.
+
+## Commands
+
+```text
+pristontale-eu --help                         Show all commands and options
+pristontale-eu gui                            Open the native dashboard
+pristontale-eu doctor                         Check required host components
+pristontale-eu update                         Install or update official files
+pristontale-eu update --repair                Verify and repair every game file
+pristontale-eu update --dry-run               Preview an update
+pristontale-eu import-game "/path/to/game"    Import an existing installation
+pristontale-eu prepare                        Build the safe runtime view
+pristontale-eu play                           Launch through Gamescope/Proton
+pristontale-eu play --no-box                  Launch without Gamescope
+pristontale-eu settings                       Show current settings
+pristontale-eu settings --init                Write default settings
+pristontale-eu launcher-update --check        Check the signed launcher channel
+pristontale-eu launcher-update                Install and activate an update
+pristontale-eu launcher-update --rollback     Restore the previous launcher
+pristontale-eu sync                           Sync without import discovery
+pristontale-eu wine-update                    Run the legacy WPF updater
+pristontale-eu fetch                          Fetch the publisher launcher
+pristontale-eu setup                          Prepare its Wine environment
+pristontale-eu cache-compatibility PATH       Cache a verified compatibility pair
+pristontale-eu cache-runtime-patch PATH       Cache a verified runtime patch
+```
+
+Use `./install.sh --dry-run` to preview dependency installation or
+`./install.sh --skip-deps` to manage distribution packages manually.