Yes u must mention your old refusal. I read your sop. The first sop was far better than the second one but still is not upto standard. It was not detailed and show feep knowledge. Your prospecting course is totally opposing your work experience and academics and this might stand as big issue in your future application.
I noticed that in your second application you did not address your fund or finance at all.
I noticed that in your second application you did not address your fund or finance at all.