Activating Office 2013 is very simple; just follow these steps:

1: Download the program from the following official link:

64-bit: https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=ProfessionalRetail&language=en-us&platform=x64&token=&version=O15GA&act=1

32-bit: https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=ProfessionalRetail&language=en-us&platform=x86&token=&version=O15GA&act=1

Note: You must right-click on the file and select "Extract in.." to extract the installer.

2: Install the program by extracting the disk image, mounting it, or burning it onto a CD.

3: Once the program is installed, open any Office application and it will ask for the license key. Copy and paste the license received in your email and click next.

4: If everything goes well, the "Activation Wizard" will open, where you will be asked if you want to activate via the internet or phone. You should select "I want to activate the software by phone."

5: To activate by phone, simply select your country and call the number displayed on the screen. It is a toll-free call that does not consume credit. An automated system will answer and give you instructions for activation.

6: After following the steps dictated by the automated system, having noted the numbers in the activation wizard, click "next" and the program will be activated.