Error in installing Qt SDK

Hello,
I am trying to install Qt SDK, I downloaded the iso image and all I know is to mount that iso image and install the software.
But I don’t know what is happening to me as after very lengthy package installation steps I get this installation failed error.
What should I do?

Install Qt SDK
There were errors with the installation. You may want to try installing again.
The installation failed.
The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
