Before Windows XP SP2 and Windows Vista, developers could statically link these libraries into their executables, making the file size huge. Microsoft encouraged a shift: use dynamic linking ( /MD flag). This meant the application would call upon shared system DLLs (like msvcr80.dll and msvcp80.dll ). If those DLLs weren't present, the application crashed immediately.
Use the msizap tool (from Windows SDK) or manually edit the MSI property MSIINSTALLPERUSER=1 via command line to force a side-by-side installation. This is dangerous—proceed only if you know Windows Installer clean-up. Silent Installation for IT Pros If you are deploying this via SCCM, PDQ, or Group Policy, use the silent switch: microsoft visual c++ 2005 redistributable x64 download
The only legitimate source is (Microsoft Download Center). Before Windows XP SP2 and Windows Vista, developers