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https://catalog.s.download.windowsupdate.com/c/msdownload/update/software/updt/2015/04/windows6.1-kb3020369-x64_499cd6bb1dd4f6950f2b147fcaff12663c3a9f99.msu

Your system must already have SP1 installed. If it does not, you can find the offline installer on the Microsoft Update Catalog . --- Windows 7 Service Pack 3 Download 64-bit Offline

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Place all four files in a single folder named Win7_SP3_Offline . --- Windows 7 Service Pack 3 Download 64-bit Offline