how can I invoke installation cancel manually

I want to cancel installation depending on return code of ExecWait.

I am able to catch return code but I dont know how to invoke installation cancelation with preceding files to be uninstalled.

thanks

"Uninstall" files using Delete and RMDir instructions.

You can "cancel" setup by Abort/Quit instruction.

Can you, please, show me an example.

I thought that abort serves for another purpose.

thanks