Here's the info on where to get it and how to install directily from the SharePoint Team Blog
Download - http://technet.microsoft.com/en-us/office/ee748587.aspx
Known Issues - http://support.microsoft.com/kb/2532126
Install the service packs in the following order on every server in the farm.
1. Service Pack 1 for SharePoint Foundation 2010
2. Service Pack 1 for SharePoint Foundation 2010 Language Pack (if applicable)
3. Service Pack 1 for SharePoint Server 2010
4. Service Pack 1 for SharePoint Server 2010 Language Pack (if applicable)
The SharePoint 2010 Products Configuration Wizard or "psconfig –cmd upgrade –inplace b2b -wait” should be run once on every server in the farm following the final update installed.
The version of content databases will be 14.0.6029.1000 after successfully installation. For more in-depth guidance for the update process, we recommend reviewing the following articles. These articles provide a correct way to deploy updates and identify known issues (and resolutions).
It is strongly recommended to install the June 2011 Cumulative Update immediately after the installation of Service Pack 1. The June Cumulative Update includes several important security and bug fixes that are not included Service Pack 1.