IOS upgrade from 10.2.2 to 11.1.0

Actually the problem got resolved may be it was with the downloaded package because as per my understanding once the IOS file is uploaded I should be able to click it and it will take me to the next page where i should be able to install it... where as it was not happening ... once i re-downloaded the file and uploaded on the box it was fine. So thanks for all the replies... but yes you may face a problem while uploading the hot-fix and this is due to the browser as it works with some browsers and is not working with some.