Using Inno 5.1.11, with script like this:

[Setup]
AppName=MyApp
AppVerName=1.2.3
AppPublisher=MyAppCo
AppPublisherURL=http://www.MyApp.com
AppSupportURL=http://www.MyApp.com
AppUpdatesURL=http://www.MyApp.com
DefaultDirName={pf}\MyApp.1
AllowNoIcons=yes
OutputBaseFilename=SetupMyApp1.2.3
OutputDir=M:\RAD\MyAppCo\MyApp1\MyBuilds\_2JK18G30M\exe
UsePreviousAppDir=yes
Compression=lzma/max
VersionInfoVersion=5.2.31
SolidCompression=yes
CreateUninstallRegKey=no
DirExistsWarning=no

The problem is that it always wants to run the setup in c:\program files\myapp.1 directory, even when I run the same SetupMyApp1.2.3.exe twice. With some other setups I've built with older versions of Inno there was no problem of this kind, at least not that I remember.

I tried omitting the DefaultDirName but it's a mandatory thing. Is there a way to get this to work, short of messing with the registry? Inno says it would write the directory into directory anyway, but it didn't (I checked). Anyone know what's up?