diff --git a/install.sh b/install.sh
old mode 100644
new mode 100755
index 48a80ec..c6b0544
--- a/install.sh
+++ b/install.sh
@@ -1,37 +1,131 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 BASE_PATH=$(
   cd $(dirname "$0");
   pwd
 )
 
+COLOR_INFO='\033[0;34m'
+COLOR_ERR='\033[0;35m'
+NOCOLOR='\033[0m'
+
+PDFM_DIR="/Applications/Parallels Desktop.app"
+PDFM_LOC="/Library/Preferences/Parallels/parallels-desktop.loc"
+PDFM_VER="18.0.1-53056"
+
 PDFM_DISP_CRACK="${BASE_PATH}/prl_disp_service"
-PDFM_DISP_DST="/Applications/Parallels Desktop.app/Contents/MacOS/Parallels Service.app/Contents/MacOS/prl_disp_service"
+PDFM_DISP_DST="${PDFM_DIR}/Contents/MacOS/Parallels Service.app/Contents/MacOS/prl_disp_service"
 PDFM_DISP_ENT="${BASE_PATH}/ParallelsService.entitlements"
 
 LICENSE_FILE="${BASE_PATH}/licenses.json"
 LICENSE_DST="/Library/Preferences/Parallels/licenses.json"
 
-echo "[*] Kill Parallels Desktop"
+PDFM_DISP_ORIGINAL_HASH="70b92c64c81c7992e901c2e23a2c2a08547e0d82f3b4fa28cc5f7e8bbac04cb6"
+PDFM_DISP_HASH="a0975389fb97f54c831d4db896d9b6983000b05dad4c8db88c3f2aced35a6dd9"
+LICENSE_HASH="ac735f3ee7ac815539f07e68561baceda858cf7ac5887feae863f10a60db3d79"
 
-killall -9 prl_client_app 2>/dev/null
-sudo pkill -9 prl_disp_service 2>/dev/null
+# read location from parallels-desktop.loc
+if [ -f "${PDFM_LOC}" ]; then
+  PDFM_DIR=$(cat "${PDFM_LOC}")
+fi
 
-echo "[*] Copy prl_disp_service"
+# check parallels desktop install
+if [ ! -d "${PDFM_DIR}" ]; then
+  echo -e "${COLOR_ERR}[-] Not found ${PDFM_DIR}, are you installed Parallels Desktop ${PDFM_VER}?${NOCOLOR}"
+  echo "    Download from here: https://download.parallels.com/desktop/v18/${PDFM_VER}/ParallelsDesktop-${PDFM_VER}.dmg"
+  exit 1
+fi
 
-sudo cp -f "${PDFM_DISP_CRACK}" "${PDFM_DISP_DST}"
-sudo chown root:wheel "${PDFM_DISP_DST}"
-sudo chmod 755 "${PDFM_DISP_DST}"
+# check parallels desktop version
+VERSION_1=$(defaults read "${PDFM_DIR}/Contents/Info.plist" CFBundleShortVersionString)
+VERSION_2=$(defaults read "${PDFM_DIR}/Contents/Info.plist" CFBundleVersion)
+INSTALL_VER="${VERSION_1}-${VERSION_2}"
+if [ "${PDFM_VER}" != "${VERSION_1}-${VERSION_2}" ]; then
+  echo -e "${COLOR_ERR}[-] This crack is for ${PDFM_VER}, but you installed is ${INSTALL_VER}.${NOCOLOR}"
+  echo "    Download from here: https://download.parallels.com/desktop/v18/${PDFM_VER}/ParallelsDesktop-${PDFM_VER}.dmg"
+  exit 2
+fi
 
-echo "[*] Sign prl_disp_service"
+# check prl_disp_service hash
+FILE_HASH=$(shasum -a 256 -b "${PDFM_DISP_CRACK}" | awk '{print $1}')
+if [ "${FILE_HASH}" != "${PDFM_DISP_HASH}" ]; then
+  echo -e "${COLOR_ERR}[-] ${FILE_HASH} != ${PDFM_DISP_HASH}${NOCOLOR}"
+  echo -e "${COLOR_ERR}[-] verify crack file (prl_disp_service) hash error.${NOCOLOR}"
+  echo -e "${COLOR_ERR}[-] please re-download crack files.${NOCOLOR}"
+  exit 4
+fi
 
-sudo codesign -f -s - --timestamp=none --all-architectures --entitlements "${PDFM_DISP_ENT}" "${PDFM_DISP_DST}"
+# check licenses.json hash
+FILE_HASH=$(shasum -a 256 -b "${LICENSE_FILE}" | awk '{print $1}')
+if [ "${FILE_HASH}" != "${LICENSE_HASH}" ]; then
+  echo -e "${COLOR_ERR}[-] ${FILE_HASH} != ${LICENSE_HASH}${NOCOLOR}"
+  echo -e "${COLOR_ERR}[-] verify crack file (licenses.json) hash error.${NOCOLOR}"
+  echo -e "${COLOR_ERR}[-] please re-download crack files.${NOCOLOR}"
+  exit 4
+fi
 
-echo "[*] Copy licenses.json"
+# check run as root
+if [ "$EUID" -ne 0 ]; then
+  echo -e "${COLOR_ERR}[-] Please run as root.${NOCOLOR}"
+  echo -e "${COLOR_INFO}    eg. sudo ${NOCOLOR}$0"
+  exit 3
+fi
 
-sudo rm -f "${LICENSE_DST}" > /dev/null
-sudo cp "${LICENSE_FILE}" "${LICENSE_DST}"
-sudo chown root:wheel "${LICENSE_DST}"
-sudo chmod 444 "${LICENSE_DST}"
+echo -e "${COLOR_INFO}[*] Exit Parallels Desktop${NOCOLOR}"
+"${PDFM_DIR}/Contents/MacOS/Parallels Service" service_stop
+killall prl_client_app 2>/dev/null
 
-echo "[*] Crack over"
+echo -e "${COLOR_INFO}[*] Start Parallels Service${NOCOLOR}"
+"${PDFM_DIR}/Contents/MacOS/Parallels Service" service_start
+
+echo -e "${COLOR_INFO}[*] Exit Parallels Desktop account ...${NOCOLOR}"
+"${PDFM_DIR}/Contents/MacOS/prlsrvctl" web-portal signout 2>/dev/null
+
+echo -e "${COLOR_INFO}[*] Disable CEP ...${NOCOLOR}"
+"${PDFM_DIR}/Contents/MacOS/prlsrvctl" --cep off 2>/dev/null
+"${PDFM_DIR}/Contents/MacOS/prlsrvctl" --allow-attach-screenshots off 2>/dev/null
+
+echo -e "${COLOR_INFO}[*] Stop Parallels Service${NOCOLOR}"
+"${PDFM_DIR}/Contents/MacOS/Parallels Service" service_stop
+
+echo -e "${COLOR_INFO}[*] Copy prl_disp_service${NOCOLOR}"
+
+rm -f "${PDFM_DISP_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+cp -X "${PDFM_DISP_CRACK}" "${PDFM_DISP_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+chown root:wheel "${PDFM_DISP_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+chmod 755 "${PDFM_DISP_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+
+# check hash
+FILE_HASH=$(shasum -a 256 -b "${PDFM_DISP_DST}" | awk '{print $1}')
+if [ "${FILE_HASH}" != "${PDFM_DISP_HASH}" ]; then
+  echo -e "${COLOR_ERR}[-] ${FILE_HASH} != ${PDFM_DISP_HASH}${NOCOLOR}"
+  echo -e "${COLOR_ERR}[-] verify target file (prl_disp_service) hash error.${NOCOLOR}"
+  exit 4
+fi
+
+echo -e "${COLOR_INFO}[*] Sign prl_disp_service${NOCOLOR}"
+
+codesign -f -s - --timestamp=none --all-architectures --entitlements "${PDFM_DISP_ENT}" "${PDFM_DISP_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+
+echo -e "${COLOR_INFO}[*] Copy fake licenses.json${NOCOLOR}"
+
+if [ -f "${LICENSE_DST}" ]; then
+  chflags -R 0 "${LICENSE_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+  rm -f "${LICENSE_DST}" > /dev/null || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+fi
+
+cp -X "${LICENSE_FILE}" "${LICENSE_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+chown root:wheel "${LICENSE_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+chmod 444 "${LICENSE_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+chflags uchg "${LICENSE_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+chflags schg "${LICENSE_DST}" || { echo -e "${COLOR_ERR}error $? at line $LINENO.${NOCOLOR}"; exit $?; }
+
+# check hash
+FILE_HASH=$(shasum -a 256 -b "${LICENSE_DST}" | awk '{print $1}')
+if [ "${FILE_HASH}" != "${LICENSE_HASH}" ]; then
+  echo -e "${COLOR_ERR}[-] ${FILE_HASH} != ${LICENSE_HASH}${NOCOLOR}"
+  echo -e "${COLOR_ERR}[-] verify target file (${LICENSE_DST}) hash error.${NOCOLOR}"
+  exit 1
+fi
+
+echo -e "${COLOR_INFO}[*] Crack over${NOCOLOR}"