Windows 7 Service Pack 1 (Beta) is available on Microsoft TechNet website. However, the win7 sp1 is not available for home users because it does not provide new end-user features but more useful to the organizations to improve Windows Operating Systemís services such as newly added feature called RemoteFX where you are able to use Remote Desktop Services platform to deploy a virtual machine. It will provide an easier Service Pack deployment environment for better IT efficiency.
In my opinion, this is a Beta version of Windows 7 and it will expire on June 30, 2011 which I would not recommend you to install because of the risks. If you really want to install it, make sure you have made proper backups to avoid the risks of installation. You need to uninstall any previous beta versions before installing this new Windows 7 Service Pack 1.
Operating System: Windows 7 32-bit and Windows 7 64-bit version
File Size: 1.25GB