Index: llvm/utils/release/build_llvm_release.bat
===================================================================
--- llvm/utils/release/build_llvm_release.bat
+++ llvm/utils/release/build_llvm_release.bat
@@ -1,6 +1,24 @@
 @echo off
 setlocal
 
+REM Script for building the LLVM installer on Windows.
+REM
+REM Note:
+REM   To enable the creation of symbolic links:
+REM   - Run the script with administrator permissions, or
+REM   - Use the 7-zip version 20.x or older.
+
+REM Check for correct 7-zip version and/or administrator permissions.
+for /f "delims=" %%i in ('7z.exe ^| findstr /r "2[1-3]"') do set version=%%i
+if not "%version%"=="" (
+  if not exist %SYSTEMROOT%\SYSTEM32\WDI\LOGFILES (
+    echo.
+    echo Script requires administrator permissions, or a 7-zip version 20.x or older.
+    echo Current version is "%version%"
+    exit /b
+  )
+)
+
 if "%1"=="" goto usage
 goto begin