Index: llvm/utils/release/build_llvm_release.bat
===================================================================
--- llvm/utils/release/build_llvm_release.bat
+++ llvm/utils/release/build_llvm_release.bat
@@ -14,6 +14,21 @@
 echo.
 exit /b
 
+REM Note:
+REM   7zip versions 21.x and higher will try to extract the symlinks in
+REM   llvm's git archive, which requires running as administrator.
+
+REM Check for correct 7-zip version and/or administrator permissions.
+for /f "delims=" %%i in ('7z.exe ^| findstr /r "2[1-9]"') 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
+  )
+)
+
 :begin
 
 REM Prerequisites: