Microsoft has now released the standalone installer for Service Pack 2 on the Microsoft Download Centre.
There are some things to know and one of the warnings is of you have used “vLite” to customise the installation, you may have removed required system components which prevent Service Pack 2 from installing. Microsoft has a workaround for this issue.
Service Pack 2 is due to hit Windows Update in the next few weeks but if you want to install it today here are the download links below.