The first Service Pack (SP1) is officially released by Microsoft for MS Office 2010 productivity suite. Microsoft Office 2010 Service Pack 1 (SP1) includes all previously released updates along with many new updates to improve security and performance.
The SP1 update will be available to all through Windows Update and Microsoft Update, automatically for people who turned On their automatic updates. For others, the official download pages and official download links for Microsoft Office 2010 SP1 are provided below.
Download 32-bit (x86) Office 2010 SP1
Microsoft Download Centre: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=26622
The above links are for the 32-bit version, to download 64-bit check the following links.
Download 64-bit (x64) Office 2010 SP1
Microsoft Download Centre: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=26617
Note: Note that you have to download the correct version (i.e 32-bit or 64-bit) which matches the installed MS Office 2010 product, and not the Windows Operating System.