2.after downloading the zip package,right click on
it and select properties.in properties window click
on the unblock button to remove any windows security
restrictions on the files.

3.extract the zip content to any folder in your computer

4.backup your website files

5.backup your database

6.add a blank app_offline.htm file in your root folder of
your website to disable your website from accessing.

7.copy the files from extraced zip package in step-3 over
the contents in your website's folder

8.set your autoupgrade to FALSE in web.config file of
your website.

9.save app_offline.htm file to app_offline.htm.save

10.then run the following link in your browser to start
upgrading-http://WEBSITENAME/install/install.aspx?mode=upgrade