Microsoft SharePoint Designer 2010 Service Pack 1 (SP1) provides the latest updates for SharePoint Designer 2010.
This service pack includes two main categories of fixes:
• Previously unreleased fixes that were made specifically for this service pack. In addition to general product fixes, these fixes include improvements in stability, performance, and in security.
• All the public updates that were released through June 2011, and all the cumulative updates that were released through April 2011.
How to obtain and install the service pack
To download the service pack from Microsoft Update, visit the following Microsoft website: Microsoft Update
Download the SP1 package from Microsoft Download Center