diff --git a/setup.sh b/setup.sh
new file mode 100755
index 0000000..b13feaf
--- /dev/null
+++ b/setup.sh
@@ -0,0 +1,114 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO_OWNER="Mboehmlaender"
+REPO_NAME="ripster"
+REPO_RAW_BASE="https://raw.githubusercontent.com/${REPO_OWNER}/${REPO_NAME}"
+BRANCHES_API_URL="https://api.github.com/repos/${REPO_OWNER}/${REPO_NAME}/branches?per_page=100"
+
+usage() {
+  cat <<'EOF'
+Verwendung:
+  bash init.sh
+
+Optionen:
+  -h, --help          Hilfe anzeigen
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unbekannter Parameter: $1" >&2
+      usage >&2
+      exit 1
+      ;;
+  esac
+done
+
+fetch_url() {
+  local url="$1"
+
+  if command -v curl >/dev/null 2>&1; then
+    curl -fsSL "$url"
+    return
+  fi
+
+  if command -v wget >/dev/null 2>&1; then
+    wget -qO- "$url"
+    return
+  fi
+
+  echo "Weder curl noch wget gefunden. Bitte eines davon installieren." >&2
+  exit 1
+}
+
+download_file() {
+  local url="$1"
+  local target="$2"
+  fetch_url "$url" > "$target"
+}
+
+select_branch() {
+  local branches_json
+  local -a branches
+  local selection
+
+  branches_json="$(fetch_url "$BRANCHES_API_URL")"
+  mapfile -t branches < <(
+    printf '%s\n' "$branches_json" \
+      | grep -oE '"name"[[:space:]]*:[[:space:]]*"[^"]+"' \
+      | sed -E 's/"name"[[:space:]]*:[[:space:]]*"([^"]+)"/\1/'
+  )
+
+  if [[ ${#branches[@]} -eq 0 ]]; then
+    echo "Keine Branches gefunden oder API-Antwort ungültig." >&2
+    exit 1
+  fi
+
+  if [[ ! -t 0 ]]; then
+    echo "Kein interaktives Terminal für die Branch-Auswahl verfügbar." >&2
+    exit 1
+  fi
+
+  echo "Verfügbare Branches:"
+  for i in "${!branches[@]}"; do
+    printf "  %2d) %s\n" "$((i + 1))" "${branches[$i]}"
+  done
+
+  while true; do
+    read -r -p "Bitte Branch auswählen [1-${#branches[@]}]: " selection
+    if [[ "$selection" =~ ^[0-9]+$ ]] && (( selection >= 1 && selection <= ${#branches[@]} )); then
+      SELECTED_BRANCH="${branches[$((selection - 1))]}"
+      return
+    fi
+    echo "Ungültige Auswahl."
+  done
+}
+
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "$TMP_DIR"' EXIT
+
+SELECTED_BRANCH=""
+select_branch
+
+INSTALL_SCRIPT="${TMP_DIR}/install.sh"
+INSTALL_URL="${REPO_RAW_BASE}/${SELECTED_BRANCH}/install.sh"
+
+echo "Lade install.sh aus Branch '${SELECTED_BRANCH}'..."
+download_file "$INSTALL_URL" "$INSTALL_SCRIPT"
+chmod +x "$INSTALL_SCRIPT"
+
+if [[ $EUID -eq 0 ]]; then
+  bash "$INSTALL_SCRIPT" --branch "$SELECTED_BRANCH"
+else
+  if ! command -v sudo >/dev/null 2>&1; then
+    echo "sudo nicht gefunden. Bitte als root ausführen." >&2
+    exit 1
+  fi
+  sudo bash "$INSTALL_SCRIPT" --branch "$SELECTED_BRANCH"
+fi