Sometimes it opens the trade the master accounts takes 2 times on the slave account...

How many times was the trade opened on the master account?

once only, and it happend 2 seperate times already for me that it opend 2 trades on the slave account when I open 1 trade on the master account, is it because I have the refresh rate set to 10 instead of 100?

I have two mt5 on my PC. One EA as Transmiter and one as Receiver and dont copy any trades. Whats wrong?

Try reinstalling them both and if that doesn't work open the common file of your metatrader and delete the file created by the TradeCopier 

Hi, is taking partials supported in this copier? How is the symbol mapping?

Please clarify what you mean by taking partials?

Great indicator, but when the transmitter initiates an order, two identical orders will appear at the receiver at the same time. Can this be solved? Thanks

Try reinstalling the program it happens but it's a rear event 

I use a trade assistant EA as, however, it only lets me attach one or the other, is there any way to bypass this?

I have used this copier and it works really well! Kudos to the author!

Is it possible to copy from MT5 to MT4 with this copier?

Thanks

Thank you for using my product, unfortunately it only works for MT5 to MT5

If you take a partial profit for example 0.05 from 0.1 lot on master account what happend on slave? In many other copy EA the slave behaves as if it thinks that a new position with 0.05 lots has been opened and also creates it.

No it doesn't take partial closing into account