I want to update from 10.7.5 to Maverick, when i click on upgrade, then nothing is happening..?? what to do?

Why when i click on updgrade from 10.7.5 to Maveirck, nothing is happening? i click the button, but then nothing start..

It's always a great idea to have backups and/or a bootable clone of your primary hard drive before attempting to install a new operating system.
OS X Lion: Time Machine overview
Are you certain that your iMac meets or exceeds all the minimum system requirements?
OS X Mavericks: System Requirements
Are you downloading it directly from the Apple Mac App store?
https://itunes.apple.com/us/app/os-x-mavericks/
OS X Mavericks 10.9 is a huge download, more than 5.3 GB, and if your internet connection speed is slow, the download might require hours or even days for to complete.

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