diff --git a/install.sh b/install.sh
index 7db3d0f..4fbf0f7 100755
--- a/install.sh
+++ b/install.sh
@@ -2,7 +2,15 @@
 set -euo pipefail
 
 BASE_URL="${BASE_URL:-https://git.jewguard.xyz/linusware/main/raw/branch/main}"
-INSTALL_DIR="${HOME}/linusware"
+
+if [ -n "${LINUSWARE_DIR-}" ]; then
+  INSTALL_DIR="$LINUSWARE_DIR"
+else
+  default_dir="${HOME}/linusware"
+  read -rp "Installation directory [~/linusware]: " input
+  INSTALL_DIR="${input:-$default_dir}"
+  INSTALL_DIR="${INSTALL_DIR/#\~/$HOME}"
+fi
 
 RED='\033[0;31m'
 GREEN='\033[0;32m'
@@ -23,7 +31,7 @@ command -v curl >/dev/null 2>&1 || error "curl is required"
 command -v md5sum >/dev/null 2>&1 || error "md5sum is required"
 command -v tar >/dev/null 2>&1 || error "tar is required"
 
-rm -rf $HOME/linusware
+rm -rf "$INSTALL_DIR"
 mkdir -p "${INSTALL_DIR}/external" "${INSTALL_DIR}/internal"
 
 download() {
diff --git a/launcher.sh b/launcher.sh
index 3ba37b9..268dc12 100755
--- a/launcher.sh
+++ b/launcher.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-INSTALL_DIR="${HOME}/linusware"
+INSTALL_DIR="${LINUSWARE_DIR:-${HOME}/linusware}"
 RED='\033[0;31m'
 YELLOW='\033[1;33m'
 CYAN='\033[0;36m'
@@ -40,6 +40,26 @@ run_updater() {
   read -rp "Press Enter to return to menu..." _
 }
 
+auto_update() {
+  [ -x "${INSTALL_DIR}/update.sh" ] && "${INSTALL_DIR}/update.sh"
+}
+
+# --- startup ---
+auto_update
+
+if [ $# -ge 1 ]; then
+  arg="$1"
+  for i in "${!edition_names[@]}"; do
+    name_lc=$(echo "${edition_names[$i]}" | tr '[:upper:]' '[:lower:]')
+    arg_lc=$(echo "$arg" | tr '[:upper:]' '[:lower:]')
+    if [ "$arg_lc" = "$name_lc" ]; then
+      exec "${editions[$i]}"
+    fi
+  done
+  echo -e "${RED}Unknown edition: $arg${NC}" >&2
+  exit 1
+fi
+
 # whiptail TUI
 if command -v whiptail >/dev/null 2>&1; then
   while true; do
diff --git a/update.sh b/update.sh
index 21e0e98..f5e1fbe 100755
--- a/update.sh
+++ b/update.sh
@@ -2,7 +2,7 @@
 set -euo pipefail
 
 BASE_URL="${BASE_URL:-https://git.jewguard.xyz/linusware/main/raw/branch/main}"
-INSTALL_DIR="${HOME}/linusware"
+INSTALL_DIR="${LINUSWARE_DIR:-${HOME}/linusware}"
 
 RED='\033[0;31m'
 GREEN='\033[0;32m'
@@ -35,7 +35,7 @@ update_edition() {
   local run_path="${INSTALL_DIR}/${edition}/linusware/run.sh"
   local ver_file="${INSTALL_DIR}/${edition}/version.txt"
 
-  [ -f "$run_path" ] || return
+  [ -f "$run_path" ] || return 0
 
   local cur_ver=""
   [ -f "$ver_file" ] && cur_ver=$(cat "$ver_file")
@@ -107,5 +107,51 @@ for dir in "${INSTALL_DIR}"/*/; do
   update_edition "$(basename "$dir")"
 done
 
+# --- self-update ---
+self_update() {
+  local script="$1"
+  local url="${BASE_URL}/${script}"
+  local cache="${INSTALL_DIR}/.scripts"
+
+  local remote_id
+  case "$url" in
+    file://*)
+      local filepath="${url#file://}"
+      remote_id=$(stat -c %Y "$filepath" 2>/dev/null) || return 0
+      ;;
+    *)
+      local headers; headers=$(curl -fsSL -I "$url" 2>/dev/null) || return 0
+      remote_id=$(echo "$headers" | grep -im1 '^etag:' | tr -d '\r') || true
+      remote_id="${remote_id#*: }"
+      if [ -z "$remote_id" ]; then
+        remote_id=$(echo "$headers" | grep -im1 '^last-modified:' | tr -d '\r') || true
+        remote_id="${remote_id#*: }"
+      fi
+      [ -n "$remote_id" ] || return 0
+      ;;
+  esac
+
+  local local_id
+  local_id=$(grep -F "$script " "$cache" 2>/dev/null | head -1 | cut -d' ' -f2-) || true
+
+  [ "$remote_id" = "$local_id" ] && { info "${script}: up-to-date"; return; }
+
+  info "${script}: updating..."
+  local tmp; tmp="$(mktemp)"
+  curl -fsSL -o "$tmp" "$url" || { rm -f "$tmp"; warn "${script}: download failed"; return; }
+  chmod +x "$tmp"
+  mv "$tmp" "${INSTALL_DIR}/${script}"
+
+  local tmp_cache; tmp_cache="$(mktemp)"
+  grep -vF "$script " "$cache" 2>/dev/null > "$tmp_cache" || true
+  echo "$script $remote_id" >> "$tmp_cache"
+  mv "$tmp_cache" "$cache"
+
+  info "${script}: updated"
+}
+
+self_update "launcher.sh"
+self_update "update.sh"
+
 echo ""
 info "Done."