diff --git a/README.md b/README.md
index 2c4ccf0..7f84cd9 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,13 @@ echo "hello" | xpbc
 curl -fsSL https://raw.githubusercontent.com/chigichan24/xpbc/main/Scripts/install.sh | bash
 ```
 
-The script downloads the latest universal binary (arm64 + x86_64) and prompts you for the install directory (default: `~/.local/bin`).
+To install to a custom directory:
+
+```sh
+curl -fsSL https://raw.githubusercontent.com/chigichan24/xpbc/main/Scripts/install.sh | bash -s -- /your/custom/path
+```
+
+The default install directory is `~/.local/bin`.
 
 ### From source
 
diff --git a/Scripts/install.sh b/Scripts/install.sh
index d65f82e..5bb38ea 100755
--- a/Scripts/install.sh
+++ b/Scripts/install.sh
@@ -4,50 +4,25 @@ set -euo pipefail
 REPO="chigichan24/xpbc"
 ASSET_NAME="xpbc-macos.artifactbundle.zip"
 ASSET_URL="https://github.com/$REPO/releases/latest/download/$ASSET_NAME"
-DEFAULT_INSTALL_DIR="$HOME/.local/bin"
-TMPDIR_INSTALL=$(mktemp -d)
+INSTALL_DIR="${1:-$HOME/.local/bin}"
 
-cleanup() {
-  rm -rf "$TMPDIR_INSTALL"
-}
-trap cleanup EXIT
+# Download zip file
+echo "Downloading latest xpbc..."
+curl -sL -o "$ASSET_NAME" "$ASSET_URL"
+unzip -qo "$ASSET_NAME" -d extracted_files
+rm "$ASSET_NAME"
 
-echo "xpbc installer"
-echo ""
-
-# Read from /dev/tty so this works even when piped via curl | bash
-printf "Install directory [%s]: " "$DEFAULT_INSTALL_DIR"
-read -r INSTALL_DIR < /dev/tty || true
-INSTALL_DIR="${INSTALL_DIR:-$DEFAULT_INSTALL_DIR}"
-
-# Expand ~ to $HOME
-INSTALL_DIR="${INSTALL_DIR/#\~/$HOME}"
-
-echo ""
-echo "Downloading latest release..."
-curl -sL -o "$TMPDIR_INSTALL/$ASSET_NAME" "$ASSET_URL"
-
-echo "Extracting..."
-unzip -qo "$TMPDIR_INSTALL/$ASSET_NAME" -d "$TMPDIR_INSTALL"
-
-VERSION=$(ls "$TMPDIR_INSTALL/xpbc.artifactbundle" | sed -n 's/^xpbc-\([^-]*\)-macos$/\1/p' | head -n 1)
+VERSION=$(ls ./extracted_files/xpbc.artifactbundle | sed -n 's/^xpbc-\([^-]*\)-macos$/\1/p' | head -n 1)
 if [ -z "$VERSION" ]; then
-  echo "Error: could not determine version from artifact bundle."
+  echo "Error: version not found in the artifact bundle."
+  rm -rf extracted_files
   exit 1
 fi
 
 mkdir -p "$INSTALL_DIR"
-cp -f "$TMPDIR_INSTALL/xpbc.artifactbundle/xpbc-$VERSION-macos/bin/xpbc" "$INSTALL_DIR/xpbc"
+cp -f "./extracted_files/xpbc.artifactbundle/xpbc-$VERSION-macos/bin/xpbc" "$INSTALL_DIR/xpbc"
 chmod +x "$INSTALL_DIR/xpbc"
+rm -rf extracted_files
 
-echo ""
 echo "Installed xpbc $VERSION to $INSTALL_DIR/xpbc"
-
-# Check if install dir is in PATH
-if ! echo "$PATH" | tr ':' '\n' | grep -qx "$INSTALL_DIR"; then
-  echo ""
-  echo "Note: $INSTALL_DIR is not in your PATH."
-  echo "Add the following to your shell profile (~/.zshrc or ~/.bashrc):"
-  echo ""
-  echo "  export PATH=\"$INSTALL_DIR:\$PATH\""
-fi
+echo "Please make sure $INSTALL_DIR is in your \$PATH"