Hello Harrold, Jon,
MSVCP50.dll is an old Visual C++ runtime file, and the latest Visual C++ Redistributable may not include it.
I would avoid downloading the DLL from third-party DLL websites. Instead, reinstall the affected program from its official source, since its installer should provide the required components.
Which program is requesting MSVCP50.dll, and what is the exact error message? That would help identify the correct installer or vendor-supported runtime.