If you install Office 2013 on Windows 8, be sure to transform the default Windows Update mechanism to Microsoft Update: that will get you the Office 2013 updates too.
Here are the one-time steps to accomplish that (which also work for other non-Windows products from Microsoft like Visual Studio, SQL Server, etc):
- Start the “Windows Update” window
- Click the link in “Get updates for other Microsoft Products. Find out more“
- Internet Explorer starts at the Microsoft Update page which detects you only have “Windows Update” configured and asks you if you want to configure “Microsoft Update” as well by agreeing to its Terms of Use.
- Clicking there refreshes the same page into “Choose how Windows can install Updates” page (I took the “current settings” choice)
- Click on the “Install” button
- In the UAC screen, confirm you are an Administrator
- Internet Explorer now refreshes the page to show “Find Windows Update using your Start Screen”
- “Windows Update” now will find updates for other Microsoft products like Office 2013 as well (some 300 megabytes in my case)
–jeroen
via: Office 2013 Plus on Windows 8 x64: how to force update? – Super User.