[eluser]Iván Argulo[/eluser]
There is no comparison between these examples you give and CodeIgniter.
All the apps you mention are ready-to-use applications, CodeIgniter is a framework for developers, to develop custom applications...
If a php scripter, as you call it, can't install properly CodeIgniter, barely would develop something WITH CodeIgniter.
I mean, it's really worth the effort to create such an installer?