Fixed install service bat file

bin/install_ddnsupdater_service.bat

@@ -1,12 +1,18 @@
 @echo off
-REM Check if a path parameter was provided
-IF "%~1"=="" (
-    echo Usage: install_ddns_service.bat ^<path_to_exe^>
+REM Get the folder where this bat is located
+SET SCRIPT_DIR=%~dp0
+
+REM Define the service exe path (same folder as bat)
+SET EXE_NAME=DDNSUpdater.exe
+SET EXE_PATH=%SCRIPT_DIR%%EXE_NAME%
+
+REM Check if the exe exists
+IF NOT EXIST "%EXE_PATH%" (
+    echo ERROR: %EXE_NAME% not found in the same folder as this script.
+    pause
     exit /b 1
 )
 
-SET EXE_PATH=%~1
-
 REM Create the service (auto-start)
 sc create DDNSUpdaterService binPath= "%EXE_PATH%" start= auto