Thank you, Mladen!
I did what I said in my earlier post, and made the changes based on StepMA Averages nmc 3.142 + arrows.mq4 which I found it posted by Wojtek in "Step indicators" thread.
It compiled without error, but in strategy tester it does not open any trade. So, as I feared, those simple changes were not enough. I named it "simple(stepMa Averages nmc 3.142 + arrows) EA v1".
I hope this is not a breach of your copyright rules.
Maybe you can take a look, if time allows you, and correct what is wrong.