Last November, Microsoft announced that they will be releasing Service Pack 1 (SP1) for the 2013 set of products including Office, SharePoint and Exchange, SP1 will deliver performance enhancements, feature updates and improve compatibility with Windows 8.1. As expected, Microsoft today released Service Pack 1 for Office 2013 customers. Service Pack 1 for Microsoft Office 2013 64-Bit and 32-Bit Editions contains new updates which improve security, performance, and stability. Additionally, the SP is a roll-up of all previously released updates.
Download them from the link below.