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How to Download and Install Service Pack 1 for Windows 7 (Tutorial)
Since it is a 7-Zip archive, you will need an extractor like 7-Zip or PeaZip . SP1.7z
Heavyweight applications like SolidWorks 2022 or CircuitMaker 2000 distribute SP1 updates in .7z format to reduce download size. How to Download and Install Service Pack 1