How do I install GMT (6.1.1) on my Windows, using cygwin

Thanks @Joaquim for the elucidation!

I will go ahead with your instructions,
At the end of the installation, I am posed with the completion of plotting a simple map, topography map, and plot earthquake epicenters on a map.

I trust I could always reach out to you, if faced with other challenges.
I really appreciate your time, @Joaquim @Andreas