It sounds like you might be looking for a reputable or official reference paper that discusses downloading Visual Studio 2012 from Microsoft. However, note:
Have questions about installing Visual Studio 2012 on a modern PC? Leave a comment below or check the Microsoft Developer Community archives—but remember, official support ended in 2023. Proceed at your own risk, and always keep your security software up to date. visual studio 2012 download microsoft
Frequently Asked Questions :: SpeedRunners General Discussions It sounds like you might be looking for
Fix: Use the full ISO image instead of the web bootstrapper. Download both the ISO and the vs_setup.msi from My.VisualStudio.com. Proceed at your own risk, and always keep
Legacy Support: Many enterprise applications were built using .NET Framework 4.5. VS 2012 provides the most "native" environment for maintaining these systems without forcing a migration to newer SDKs.