You must take the website offline before you proceed with the upgrade.
To take the website offline:
|1.||In the root of the website locate the file app_offline.htm_rename and rename it to app_offline.htm.|
By default, the root of the website is located in "C:\Skyline\wwwroot". If you are not sure where your Skyline Website is located refer to the section on locating your Skyline Website. Renaming this file will change to Skyline homepage to a holding page shown in the example below.