Windows 7 Service Pack 3 (SP3) does not exist.
If you are reading this article, you are likely trying to update an older Windows 7 machine. You may be looking for a single, comprehensive file—specifically a "Windows 7 Service Pack 3"—to bring your system up to date without spending hours downloading hundreds of smaller files. --- Windows 7 Service Pack 3 Download 64-bit Offline
Microsoft never released a Service Pack 3 for Windows 7. The operating system only received two major service packs: Service Pack 1 (SP1) and Service Pack 2 (SP2). Windows 7 Service Pack 3 (SP3) does not exist
Downloading a large offline package (the "fake SP3") bypasses this problem. It allows you to install years' worth of security patches in one go, without relying on the fragile Windows Update tool until the system is patched enough to work correctly. To simulate a "Service Pack 3" experience, you need to download the Convenience Rollup package. Here is how to find and download the 64-bit offline installer safely. Prerequisites Before you can install the major rollup, your system must have Service Pack 1 installed. If you are installing from a newer disc or ISO, SP1 might already be included. If not, you must download and install Windows 7 SP1 (KB976932) first. Step 1: Get the Servicing Stack Update (SSU) Before installing the big rollup, you must update the "Servicing Stack"— Microsoft never released a Service Pack 3 for Windows 7