Installing MonoDevelop
Mono and MonoDevelop are alternative C# programming compiler and IDE. They are now owned by microsoft, but at one point was independant.
Get the files
You will need to download the windows version from this link, it is now called Xamarin Studio:
Below is a screenshot of the files you are looking for:
Make sure you download the .NET Framework 4.5 & GTK# for .NET from the links on the above page before installation.
Other downloads required
MSBuildTools 2013 - MSBuildTools 2013 Download Page
MSBuildTools 2015 - MSBuildTools 2015 Download Page