Hello,
Unfortunately this behavior is not supported by Advanced Installer. However, you can implement this behavior yourself from within a custom action.
You could write a small app that could get the string contained by the APPDIR property and verify if it only contains English characters.
You could launch this app using a Custom action.
For example, you can create your custom action as
a custom action written in C# or
a custom action written in C++.
You can also use the
VBScript or a
PowerShell custom action to implement this functionality.
Best regards,
Sorin