Here’s a useful, concise write-up on — what it is, why it matters, where to find it legitimately, and how to use it effectively. What Is Visual Studio 2010 SP1 ISO? Visual Studio 2010 SP1 is the first (and only) service pack for VS2010, released in March 2011. The ISO is a disc image file that contains the complete SP1 installer, often bundled with critical updates, hotfixes, and sometimes the original VS2010 + SP1 combined.