While "Windows 7 Service Pack 3" is a myth, the operating system lives on through the Service Pack 1 ISO combined with the Convenience Rollup. If you must use Windows 7 for legacy purposes, ensure you download the ISO directly from Microsoft (if you have a key) and apply the Rollup updates manually.
To simulate a "Service Pack 3" experience, you should manually download the followed by the May 2016 Convenience Rollup (KB3125574) . This Rollup contains almost all the updates released between SP1 and that date. windows 7 iso sp3
The Truth About "Windows 7 ISO SP3": Official Status, Risks, and Safe Alternatives While "Windows 7 Service Pack 3" is a
Think twice before downloading "SP3" torrents – your data isn't worth the risk. This Rollup contains almost all the updates released
Some users might seek out a Windows 7 ISO SP3 for various reasons: