diff --git a/INSTALLATION.md b/INSTALLATION.md
index df0360e..aabd3d4 100644
--- a/INSTALLATION.md
+++ b/INSTALLATION.md
@@ -1,160 +1,84 @@
-# Installation & Run
+# Installation & Run (Linux)
-Tauri 2 desktop app. The frontend is React 19 + Vite + TypeScript; the backend is Rust + SQLite via sqlx.
+Tauri 2 + React + Vite + Rust + SQLite. Tested on Ubuntu 22.04+ and Pop!_OS.
---
## 1. Prerequisites
-### Common (all platforms)
-- **Node.js ≥ 18** and **npm** (or pnpm / yarn — the lockfile is `package-lock.json`).
-- **Rust** stable, installed via [rustup](https://rustup.rs/):
- ```bash
- curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
- source "$HOME/.cargo/env"
- ```
-- **Tauri CLI** (project-local; no global install needed — `npm install` pulls `@tauri-apps/cli`).
+### Node.js 20 (or any LTS ≥ 18)
+The Tauri 2 CLI uses optional chaining and crashes with `SyntaxError: Unexpected token '.'` on Node 14 or older. Check with `node -v`.
-### Linux (Debian / Ubuntu / Pop!_OS)
+```bash
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
+exec $SHELL
+nvm install 20
+nvm alias default 20
+```
+
+### Rust (stable)
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+source "$HOME/.cargo/env"
+```
+
+### System libraries (Debian / Ubuntu / Pop!_OS)
```bash
sudo apt update
sudo apt install -y \
- build-essential curl wget file \
+ build-essential curl wget file pkg-config \
libwebkit2gtk-4.1-dev \
libssl-dev \
libayatana-appindicator3-dev \
librsvg2-dev \
- libsoup-3.0-dev \
- pkg-config
+ libsoup-3.0-dev
```
-On Ubuntu 22.04 / 24.04 the `4.1` WebKitGTK packages are correct for Tauri 2. If `apt` complains, also try `libjavascriptcoregtk-4.1-dev`.
-
-### Linux (Fedora / RHEL)
-```bash
-sudo dnf install -y \
- webkit2gtk4.1-devel openssl-devel curl wget file \
- libappindicator-gtk3-devel librsvg2-devel \
- libsoup3-devel @development-tools
-```
-
-### Linux (Arch)
-```bash
-sudo pacman -S --needed \
- webkit2gtk-4.1 base-devel curl wget file \
- openssl appmenu-gtk-module libayatana-appindicator \
- librsvg libsoup3
-```
-
-### macOS
-- **Xcode Command Line Tools**:
- ```bash
- xcode-select --install
- ```
-- That's it — Apple ships everything else (WebKit, Core Foundation, etc.).
-
-### Windows
-- **Microsoft C++ Build Tools** (Visual Studio Installer → "Desktop development with C++").
-- **WebView2 runtime** — pre-installed on Windows 11 / recent Win10. Otherwise grab it from .
---
-## 2. Clone and install
+## 2. Install dependencies
```bash
-git clone KML_Tool
-cd KML_Tool/kml_map_tool
+cd kml_map_tool
npm install
```
-`npm install` also fetches `@tauri-apps/cli`. Rust dependencies build on the first `tauri dev` / `tauri build`.
+This also pulls `@tauri-apps/cli`. Rust deps build on first run.
---
-## 3. Run in development mode
+## 3. Run in development
```bash
npm run tauri dev
```
-What this does:
-- Starts Vite on `http://localhost:1420` (HMR for React).
-- Compiles the Rust backend (`cargo build` — first run takes 5–10 min as sqlx, geo, kml, deck.gl deps cache).
-- Launches the desktop window. Closing the window stops both processes.
+- First run: 5–10 min while Rust deps compile.
+- Subsequent runs: seconds.
+- Closing the window stops everything.
-**First-run database** — the app creates `markers.db` inside the OS app-data directory:
-- Linux: `~/.local/share/com.kml_map_tool.app/markers.db` (or similar — varies by distro / Tauri identifier).
-- macOS: `~/Library/Application Support/com.kml_map_tool.app/markers.db`
-- Windows: `%APPDATA%\com.kml_map_tool.app\markers.db`
-
-You'll see migrations run silently in the logs. To wipe the DB and start over, use **Reset DB** in the Data section of the app, or delete the file.
-
-### Useful scripts
-```bash
-npm run dev # frontend only (Vite, no Tauri window) — for browser-only UI testing
-npm run build # type-check + production frontend build (output: dist/)
-npm run preview # preview the production frontend (no Tauri)
-npm run tauri dev # full Tauri dev (frontend + Rust backend + desktop window)
-```
-
-### Rust-only compile check
-From `kml_map_tool/src-tauri`:
-```bash
-cargo check # fast type-check
-cargo build # full debug build
-```
-
-### TypeScript check
-From `kml_map_tool`:
-```bash
-npx tsc --noEmit
-```
+The SQLite database is created at `~/.local/share/com.kml_map_tool.app/markers.db` on first launch. To wipe it, use **Reset DB** in the app or delete the file.
---
-## 4. Build a production binary
+## 4. Build a release binary
```bash
npm run tauri build
```
-Outputs to `src-tauri/target/release/bundle/`:
-
-- **Linux**: `*.AppImage`, `*.deb`, `*.rpm` (depending on installed packagers; `appimagetool` and `dpkg-deb` need to be on `$PATH` for the corresponding bundle to be produced).
-- **macOS**: `*.app` and `*.dmg`. For a signed/notarised build, set `APPLE_*` env vars per the Tauri docs.
-- **Windows**: `*.msi` (WiX) and `*.exe` (NSIS).
-
-Single-arch native build only — cross-compiling Tauri apps (e.g. macOS → Linux) is not supported out of the box.
+Output: `src-tauri/target/release/bundle/` — `.AppImage`, `.deb`, and `.rpm` (whichever packagers are present on `$PATH`).
---
-## 5. First steps after launch
+## 5. Troubleshooting
-1. **Login screen** — create a user (any username + display name) and click Login. The username is recorded on every audit-log entry.
-2. **Import…** → pick `Fixed assets (JSON)` and point at one of the sample files in the repo (e.g. `Double_Arm_Street_Light_mcw.json`).
-3. The map auto-centers on the first imported asset; pan / zoom to explore.
-4. See [README.md](./README.md) for the full feature tour.
+| Symptom | Fix |
+|---|---|
+| `SyntaxError: Unexpected token '.'` from `tauri.js` | Node too old. Upgrade to ≥ 18, then `rm -rf node_modules package-lock.json && npm install`. |
+| `error: linker 'cc' not found` | `sudo apt install build-essential` |
+| `failed to find webkit2gtk-4.1` | Install `libwebkit2gtk-4.1-dev`. On Ubuntu < 22.04 only `4.0` is available — upgrade Ubuntu. |
+| Blank white window on Wayland | `WEBKIT_DISABLE_COMPOSITING_MODE=1 npm run tauri dev` |
+| `g_object_unref: assertion 'G_IS_OBJECT (object)' failed` on quit | Harmless WebKitGTK noise. Ignore. |
----
-
-## 6. Troubleshooting
-
-### `error: linker 'cc' not found` (Linux)
-`build-essential` (Debian/Ubuntu) or the equivalent dev tools group is missing. See prerequisites above.
-
-### `failed to find webkit2gtk-4.1` (Linux)
-The dev package is missing. On Ubuntu < 22.04 you may have only `4.0` available — Tauri 2 requires `4.1`. Upgrade or build WebKitGTK from source.
-
-### `WebView2 runtime not found` (Windows)
-Install from .
-
-### Rust build is incredibly slow / OOM
-The first build pulls hundreds of crates. Add `RUSTFLAGS="-C codegen-units=16"` and use a release machine with ≥ 8 GB RAM. Subsequent builds are incremental and fast.
-
-### `g_object_unref: assertion 'G_IS_OBJECT (object)' failed` on shutdown (Linux)
-Harmless — upstream WebKitGTK / libsoup ref-counting noise. Ignore.
-
-### "Database is locked" errors during heavy bulk operations
-sqlx pool size is 4. If you hit contention, increase `max_connections` in `src-tauri/src/db.rs` and rebuild.
-
-### App window blank / white on Wayland
-Try `WEBKIT_DISABLE_COMPOSITING_MODE=1 npm run tauri dev`.
+See [README.md](./README.md) for the user guide.