If I want the EA to close the buy order only when the new sell order is placed, what setup do I need to set? 

Do I set No New Entry If trade Exists = true and Enable Trailing of Supertrend = false, while choosing Entry Stragegy buy-entry: whne supertrend turns green.... and Exit Stragegy buy-exit: when supertrend truns red....

Is setting as above setup is correct or not?

Yes that's correct 

Thank you for you quick response. There is one more thing I would like to ask. Is there anyway that you can show the supertrend indicator on the chart as per the setting I set in the EA so that I know that now the supertrend line has changed to green or red? It will be easier for me to see on the graph. I have some supertrend indicatiors but it doesn't seems to have the same value as yours even if I set the period and multiplier the same as your EA.

I have a free supertrend indicator as well. Please search on profile page. You will get that

Yes I have already got the free supertrend indicator but it seems that the value doesn't match with your EA even if I put the same settings.

Also at the moment I checked the version I got is 18.0. How do I update to 19.0?

You have to make sure , you are using the same input values for supertrend Settings in both ea and the indicator. 

I did put the same input values for supertrend setting indicator and ea but as I said it doesn't seem to match. 

Regarding the update, if I delete and reinstall will it reduce the number of activations available for me?

No activations would not be considered in case of update.

As you can see the value of supertrend is at 3439.093 but your currentTrendDoA is still at 3445.092 is your currentTrend DoA is supposed to show the value of the EA currently working at or not? Or is it my misunderstanding?

Here is the setting of the indicator

and below is the setting of your ea

This indicator is not mine

OK thanks

I have already installed your indicator. Just to check is the currentTrendDoA supposed to update to the most recent super trend line level or not since the value still show the highest value of the trend line still. It doesn't change according to the recent trend line.

Okay I got the reason , you probably have 1 trade active , the only changes those values when there is no trade . This has been done to improve speed of the ea. We don't need o update supertrend values if there is a trade active and trailing based on supertrend disabled.

When I run test, I see many errors occur notification in log:

  Error Occured placing trade 5052

 what is the problem and how to fix it?

Can you send me your set file? I will check and get back to you

Yes please!

The EA work well to me, it runs smoothly in real account. thanks for your support!

The developer is VERY helpful and genuinely interested in making sure his product works correctly.

There are very few companies like this!!

I highly recommend them with all my respect!

Yes you are correct. Also make sure sl tp mode is selected to no sltp. And the all sl tp values set to 0