When prompted by your web browser, save the file into your system's WCS directory. Do NOT save the file to your Desktop, My Documents, or other location. If the file ends up elsewhere, move it to your system's WCS directory before proceeding with step 3.
When the file finishes downloading, run it to decompress the update. Windows: You may be asked about replacing existing files, answer yes. Mac: The file is a self-extracting SIT file, and may ask you about overwriting existing files. Overwrite existing files.