Audicity won’t start because “api-ms-win-crt-runtime-1-1-0.dll is missing from your computer. Try reinstalling the program to fix this problem.” What does this mean?
It means (rather cryptically) that Windows needs a more recent version of Visual C++ than is available on your computer (I’m guessing that you are using an old version of Windows ?).
Audacity requires "Visual C++ Redistributable for Visual Studio 2015 ", which is available from Microsoft here: https://www.microsoft.com/en-ie/download/details.aspx?id=48145