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+# AZA Installer / Update System Plan (Step 17)
+
+## 1. Windows installer approach
+
+**Recommended tool:** PyInstaller
+
+**Expected output:** `AZA_Assistant.exe`
+
+---
+
+## 2. Release folder structure
+
+```
+release/
+  aza_assistant.exe
+  version.json
+  update_manifest.json
+```
+
+---
+
+## 3. Update mechanism concept
+
+**On application startup:**
+
+Check backend endpoint:
+
+```
+GET /version
+```
+
+**If version is newer:**
+
+- Notify user and allow download.
+
+---
+
+## 4. Version file example
+
+```json
+{
+  "version": "0.1.0",
+  "download_url": "https://example.com/download/aza_assistant.exe"
+}
+```
+
+---
+
+## 5. Safety rules
+
+- Never auto-update without user confirmation
+- Keep previous version until update success