Users searching for this term usually fall into one of three categories. Below are the correct actions for each scenario:
Many users search for "SP3" because they remember it from the Windows XP era, where SP3 was the final major update. For Windows 7, any file claiming to be "Service Pack 3" is likely: Windows 7 SP3 Installation - Microsoft Q&A windows 7 service pack 3 download 64-bit
A warning he’d never seen before: This update is intended for enterprise long-term servicing only. Install on consumer hardware may result in unpredictable behavior. Proceed? Users searching for this term usually fall into
Windows 7 Service Pack 3 64-bit Operating System Memory: 32.0 GB (31.9 GB usable) Install on consumer hardware may result in unpredictable
While Microsoft never released an SP2, they did release a "Convenience Rollup Update" in May 2016. This package contains all security and reliability fixes released between SP1 and that date. Functionally, this acts as a "Service Pack 2" by significantly reducing update times after a fresh install.