If you are looking for the full installation media (ISO) rather than just the service pack update, the hosts verified community uploads of original retail and volume license discs:
Searching for specific file names like on third-party sites like FaresCD can be risky, as downloading from unofficial sources exposes you to viruses, malware, and counterfeit software . If you are looking for the full installation
Instead, it is safer to use official or well-documented archival sources to obtain Microsoft Office 2013 Service Pack 1 (SP1) and its updates. Official Microsoft Resources and counterfeit software . Instead
: You can find various language versions, including English (en), on the Internet Archive . Important Considerations Description of Microsoft Office 2013 Service Pack 1 (SP1) including English (en)