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Hi:

I have an app, that needs directx to run so I need to include it into the setup and install only if it's not present in the system. Is there a way to do that?
I am using createinstall free version 6.3.3
Thanks in advance.

Do you have the redistributable package of DirectX?
Also, you should know how to detect if DirectX on user's machine or not.
For example, you have a variable 'directx' which was assigned 1 if the DirectX has already been installed.
Insert If Statement command
Variable: directx
Comparion: Empty/Zero
Now insert Temporary Files (or Installation Files) command and Run Application commands into this If Statement.
The first command unpacks the DirectX package and the second one runs it.