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+---
+epic: 8
+story: 8.10
+title: "Installer & Distribution"
+status: draft
+---
+
+## Epic 8 — Windows App (Rust + iced)
+**Goal:** Fast, lightweight native Windows app -- single .exe, no runtime dependencies.
+
+### Story 8.10: Installer & Distribution
+
+As a **Windows user**,
+I want professional installation and distribution options,
+So that I can install CalcPad through my preferred method with confidence in its authenticity.
+
+**Acceptance Criteria:**
+
+**Given** the release build is complete
+**When** the `.msi` installer is generated via WiX
+**Then** it installs CalcPad to `%ProgramFiles%\CalcPad\`, creates Start Menu shortcuts, registers the `.calcpad` file association, and sets up the uninstaller
+
+**Given** the installer is built
+**When** the `.msi` is signed
+**Then** it has a valid Authenticode signature so Windows SmartScreen does not block it
+
+**Given** the user prefers winget
+**When** the user runs `winget install calcpad`
+**Then** CalcPad is installed from the winget repository using the published manifest
+
+**Given** the user wants a portable version
+**When** they download the `.zip` distribution
+**Then** the zip contains `calcpad.exe`, `portable.marker`, and a `data/` directory
+**And** the user can run it immediately without installation
+
+**Given** the release binary is built
+**When** its file size is measured
+**Then** the `.exe` is under 15 MB (including the statically linked engine)
+
+**Given** the installer is run
+**When** installation completes
+**Then** no runtime dependencies are required (no .NET, no MSVC runtime, no WebView2) -- CalcPad runs standalone