update: update.bat create a backup before deleting files

update.bat

@@ -1,12 +1,41 @@
 @echo off
+
+REM Backup files before Deleting
+IF EXIST "Medicat Installer.exe" (
+    copy "Medicat Installer.exe" "Medicat Installer.exe.bak"
+)
+IF EXIST "MediCat_Installer.exe" (
+    copy "MediCat_Installer.exe" "MediCat_Installer.exe.bak"
+)
+IF EXIST "Medicat Installer.bat" (
+    copy "Medicat Installer.bat" "Medicat Installer.bat.bak"
+)
+IF EXIST "MediCat_Installer.bat" (
+    copy "MediCat_Installer.bat" "MediCat_Installer.bat.bak"
+)
+
 timeout 2 > nul
-DEL "Medicat Installer.exe"
-DEL "MediCat_Installer.exe"
-DEL "Medicat Installer.bat"
-DEL "MediCat_Installer.bat"
+
+DEL "Medicat Installer.exe" 2>nul
+DEL "MediCat_Installer.exe" 2>nul
+DEL "Medicat Installer.bat" 2>nul
+DEL "MediCat_Installer.bat" 2>nul
+
 cls
 echo.Updating Medicat Installer. Please wait while the new file is downloaded.
 curl http://url.medicatusb.com/installerupdate -o Medicat_Installer.bat -q -L
+
+REM Check if the download was successful
+IF NOT EXIST "Medicat_Installer.bat" (
+    echo ERROR: Failed to download the new file.
+    REM Restore the backup if it exists
+    IF EXIST "Medicat Installer.bat.bak" (
+        copy "Medicat Installer.bat.bak" "Medicat Installer.bat"
+    )
+    pause
+    exit /b 1
+)
+
 cls
-start cmd /k Medicat_Installer.bat Medicat_Installer.bat
-del %0 && exit
+start cmd /k Medicat_Installer.bat
+del %0 && exit