Post SP1 for Win 7 and Server 2008R2 there is a rollup package through April 2016. Detailed Here: https://support.microsoft.com/en-us/kb/3125574
The download for this package is here http://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB3125574
There is a prerequisite if a clean install of sp1 as on the first link: April 2015 servicing stack update for Windows 7 and Windows Server 2008 R2 (KB3020369)
It does cause a few issues with HyperV and network cards soo if that applies please read the details on the MS page