Every time you do a fresh install of Windows 7, even if your ISO file has Service Pack 1 integrated, it takes ages to install all available updates. So, reinstalling becomes a nightmare for those who use the genuine installation media of Windows 7 SP1. Microsoft has decided to change this situation and has released a convenience rollup for Windows 7 SP1 which will save your time.
The convenience rollup package acts like a Service Pack 2 for Windows 7 and includes all security patches and almost all the non-security updates for operating system core components released after Windows 7 SP1. This package is cumulative meaning once you install it you won't have to install updates released up to April 2016. The update is released under ID KB3125574.
For existing users who have an up-to-date Windows 7 installed on their PC, the convenience update (KB3125574) is optional, since all the security updates contained in this update and some optional non-security updates should already be installed on your PC via Windows Update.
To apply this update, you must have installed the April 2015 servicing stack update for Windows 7 (KB3020369). For most users, it will be already installed.
Download Windows 7 Convenience rollup
Windows 7 Convenience rollup (KB3125574) can be installed from the Windows Update Catalog. The Windows Update Catalog website can only be used from Internet Explorer. Open the following hyperlink in IE: Download Windows 7 Convenience rollup
Windows 7 Convenience rollup direct download links Alternatively, you can download it using these direct download links: