Don't need to specify the max option - its the default.
diff --git a/expat/win32/expat.iss b/expat/win32/expat.iss
index 44b8199..400b315 100644
--- a/expat/win32/expat.iss
+++ b/expat/win32/expat.iss
@@ -20,7 +20,7 @@
 DefaultDirName={pf}\Expat 2.0.1
 UninstallFilesDir={app}\Uninstall
 
-Compression=lzma/max
+Compression=lzma
 SolidCompression=yes
 SourceDir=..
 OutputDir=win32