diff --git a/README.md b/README.md
index dd246de0..6bdf404e 100644
--- a/README.md
+++ b/README.md
@@ -39,24 +39,41 @@ If you have access to GitHub Copilot via your organization or enterprise, you ca
 
 ### Installation
 
-Install globally with npm:
+Install with [WinGet](https://github.com/microsoft/winget-cli) (Windows):
 
 ```bash
-npm install -g @github/copilot
+winget install GitHub.Copilot
 ```
 
-Install with [Homebrew](https://formulae.brew.sh/cask/copilot-cli):
+Install with [Homebrew](https://formulae.brew.sh/cask/copilot-cli) (macOS and Linux):
 
 ```bash
 brew install copilot-cli
 ```
 
-Install with [WinGet](https://github.com/microsoft/winget-cli):
+Install with the install script (macOS and Linux):
 
 ```bash
-winget install GitHub.Copilot
+curl -fsSL https://gh.io/copilot-install | bash
+```
+
+Or
+
+```bash
+wget -qO- https://gh.io/copilot-install | bash
 ```
 
+Install with [npm](https://www.npmjs.com/package/@github/copilot) (macOS, Linux, and Windows):
+
+```bash
+npm install -g @github/copilot
+```
+
+Use `| sudo bash` to run as root and install to `/usr/local/bin`.
+
+Set `PREFIX` to install to `$PREFIX/bin/` directory. Defaults to `/usr/local`
+when run as root or `$HOME/.local` when run as a non-root user.
+
 ### Launching the CLI
 
 ```bash
diff --git a/install.sh b/install.sh
new file mode 100755
index 00000000..39f069fa
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+set -e
+
+# GitHub Copilot CLI Installation Script
+# Usage: curl -fsSL https://gh.io/copilot-install | bash
+#    or: wget -qO- https://gh.io/copilot-install | bash
+# Use | sudo bash to run as root and install to /usr/local/bin
+# Export PREFIX to install to $PREFIX/bin/ directory (default: /usr/local for
+# root, $HOME/.local for non-root), e.g., export PREFIX=$HOME/custom to install
+# to $HOME/custom/bin
+
+echo "Installing GitHub Copilot CLI..."
+
+# Detect platform
+case "$(uname -s || echo "")" in
+  Darwin*) PLATFORM="darwin" ;;
+  Linux*) PLATFORM="linux" ;;
+  *)
+    if command -v winget >/dev/null 2>&1; then
+      echo "Windows detected. Installing via winget..."
+      winget install GitHub.Copilot
+      exit $?
+    else
+      echo "Error: Windows detected but winget not found. Please see https://gh.io/install-copilot-readme" >&2
+      exit 1
+    fi
+    ;;
+esac
+
+# Detect architecture
+case "$(uname -m)" in
+  x86_64|amd64) ARCH="x64" ;;
+  aarch64|arm64) ARCH="arm64" ;;
+  *) echo "Error: Unsupported architecture $(uname -m)" >&2 ; exit 1 ;;
+esac
+
+DOWNLOAD_URL="https://github.com/github/copilot-cli/releases/latest/download/copilot-${PLATFORM}-${ARCH}.tar.gz"
+echo "Downloading from: $DOWNLOAD_URL"
+
+# Download and extract with error handling
+TMP_TARBALL="$(mktemp)"
+if command -v curl >/dev/null 2>&1; then
+  curl -fsSL "$DOWNLOAD_URL" -o "$TMP_TARBALL"
+elif command -v wget >/dev/null 2>&1; then
+  wget -qO "$TMP_TARBALL" "$DOWNLOAD_URL"
+else
+  echo "Error: Neither curl nor wget found. Please install one of them."
+  exit 1
+fi
+
+# Check that the file is a valid tarball
+if ! tar -tzf "$TMP_TARBALL" >/dev/null 2>&1; then
+  echo "Error: Downloaded file is not a valid tarball or is corrupted." >&2
+  rm -f "$TMP_TARBALL"
+  exit 1
+fi
+
+# Check if running as root, fallback to non-root
+if [ "$(id -u 2>/dev/null || echo 1)" -eq 0 ]; then
+  PREFIX="${PREFIX:-/usr/local}"
+else
+  PREFIX="${PREFIX:-$HOME/.local}"
+fi
+INSTALL_DIR="$PREFIX/bin"
+if ! mkdir -p "$INSTALL_DIR"; then
+  echo "Error: Could not create directory $INSTALL_DIR. You may not have write permissions." >&2
+  echo "Try running this script with sudo or set PREFIX to a directory you own (e.g., export PREFIX=\$HOME/.local)." >&2
+  exit 1
+fi
+
+# Install binary
+if [ -f "$INSTALL_DIR/copilot" ]; then
+  echo "Notice: Replacing copilot binary found at $INSTALL_DIR/copilot."
+fi
+tar -xz -C "$INSTALL_DIR" -f "$TMP_TARBALL"
+chmod +x "$INSTALL_DIR/copilot"
+echo "✓ GitHub Copilot CLI installed to $INSTALL_DIR/copilot"
+rm -f "$TMP_TARBALL"
+
+# Check if install directory is in PATH
+case ":$PATH:" in
+  *":$INSTALL_DIR:"*) ;;
+  *)
+    echo ""
+    echo "Warning: $INSTALL_DIR is not in your PATH"
+    echo "Add it to your PATH by adding this line to your shell profile:"
+    echo "  export PATH=\"\$PATH:$INSTALL_DIR\""
+    ;;
+esac
+
+echo ""
+echo "Installation complete! Run 'copilot help' to get started."