diff --git a/build/appveyor/MSVC-appveyor-install.bat b/build/appveyor/MSVC-appveyor-install.bat
index f973d29..bc4655a 100644
--- a/build/appveyor/MSVC-appveyor-install.bat
+++ b/build/appveyor/MSVC-appveyor-install.bat
@@ -57,3 +57,10 @@
             twisted                       || EXIT /B
 
 cinst -y ghc                              || EXIT /B
+
+:: Adobe Flex SDK 4.6 for ActionScript
+MKDIR "C:\Adobe\Flex\SDK\4.6"             || EXIT /B
+appveyor DownloadFile http://download.macromedia.com/pub/flex/sdk/flex_sdk_4.6.zip -FileName C:\Adobe\Flex\SDK\4.6\SDK.zip || EXIT /B
+CD "C:\Adobe\Flex\SDK\4.6"                || EXIT /B
+7z x SDK.zip                              || EXIT /B
+SETX FLEX_HOME "C:\Adobe\Flex\SDK\4.6"