This step might have been performed for you. To check your preferences, on the Safari menu, click Preferences, and then click General. If you are using Safari, the downloaded file is saved to the desktop or your Downloads folder unless you specified a different location in the Preferences dialog box of Safari.
Make sure that your computer meets the minimum system requirements.Quit any applications that are running, including all Office applications, Microsoft Messenger, and Office Notifications, because they might interfere with the installation.