Step 1 - Open any Office program, such as Word, and then click the file button at the top left

Step 2 - Press the Account button on the left, then the Update Options button, then click Update Now

Step 3 - It might take a minute to show up, but you will eventually see this screen show up. 

Step 4 - Then it will list the Office programs you need to close out of to continue. Save your work in all and close out of them, then press continue

Step 5 - Wait for updates to be applied

Step 6 - If everything went well, you should see this screen. Click the close button and continue as normal.