I will try to give you a another help on how to to do:
In your folder where InstallAware has been Installed there is file for test automation purpose called "pDelphiAutomate.exe". This exe file it is just a simple application that creates from scratch, an IA test script, an Ia project file and if you want, it will build the final setup file based on the previous file.
This file it is available under: "C:\Program Files (x86)\InstallAware\InstallAware 2012\Automation\Examples\Delphi" if you execute a standard IA install.
So copy this file everywhere you want in a folder, then in the same folder copy all the files and subfolder you have in your install IA folder: "C:\Program Files (x86)\InstallAware\InstallAware 2012\Automation\Libraries". Those are redistributable libraries used by automation.
Now execute "pDelphiAutomate.exe" from the folder that you have created, in the application UI specify a project name, add a file to install, chose an output file folder and specify a name for your test project.
Press the button "Generate Script", when done build your project by pressig the button "Build Project".
If there are errors a log file will tell you exactly what is missing to complete the build
In your target folder for the new project that you are creating you must copy the UI files required by the setup, these are available in any setup theme dialog folder of your IA installation:
Copy also the file "Index.htlm" from "C:\Program Files (x86)\InstallAware\InstallAware 2012\Automation\Examples\Delphi" to your setup test folder.
NOW YOU SHOULD HAVE BUILDED THE PROJECT.
To do the same in your Asp.net project, create a project and made in your project appropriate calls to "miaauto.dll" (all binaries as above must be available for your application), if you want to replicate the same as the above test, have a look at the generated test script. See also the InstallAware documentation for "Automation" where each function available is documented. See also all the other topics because explains all you need to do it.
This is essentially what you have to do .... the rest it is up to you.
I really hope that helps you