Sometimes there is a PC that doesn\'t have IIS. Either it disabled or either it not installed. In this case I need to enable it myself according to those steps.
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Regarding your experience with Advanced Installer. You ended up with IIS Express installed because you used our predefined support for prerequisites. You should have been using the predefined support to install Windows Feature Bundles.
Using this support you can easily select which OS feature should be enabled and also set custom conditions. On our YouTube channel you can find examples/tutorials: