This executable is an installer that deploys C runtime (CRT), Standard C++, MFC, and OpenMP libraries. Many older programs—such as AutoCAD 2010, older Adobe products, or classic PC games—were compiled with Visual Studio 2008 SP1. They require these specific DLLs (like msvcr90.dll or msvcp90.dll ). Without the redistributable, the program fails to launch or, in this case, the installer itself cannot proceed.
Sometimes the error occurs because a setup program expects the specific filename vcredist-x64-2008-sp1-x64.exe to exist in a local folder. The file you download from Microsoft might be named differently (e.g., vcredist_x64.exe ). You can work around this by extracting and renaming. vcredist-x64-2008-sp1-x64.exe not found