Microsoft has released Service Pack 1 for its Office 2013, SharePoint 2013 and Exchange Server 2013 and you should see notification for update anytime soon through your Windows Update section.
This SP1 brings compatibility improvement with Windows 8.1, compatibility improvement with IE 11, compatibility improvement with modern hardware, provides support for task pane apps in Outlook 2013, SkyDrive Pro is now OneDrive for Business and much more.
This update supports on Windows 7, Windows 8, Windows 8.1, Windows Server 2008 R2, Windows Server 2012 and Windows Server 2012 R2 operating systems
Download Office 2013 Service Pack 1 32-bit | Download Office 2013 Service Pack 1 64-bit
Download Project 2013 Service Pack 1 32-bit | Download Project 2013 Service Pack 1 64-bit
Download Visio 2013 Service Pack 1 32-bit | Download Visio 2013 Service Pack 1 64-bit
Download SharePoint Designer 2013 SP1 32-bit | Download SharePoint Designer 2013 SP1 64-bit
Download Office 2013 Language SP1 32-bit | Download Office 2013 Language SP 1 64-bit