The Holy Grail is an mt4 (MetaTrader 4) indicator that can be used with any forex trading system/strategy for additional confirmation of trade entry or exit.
Unzip the downloaded HOLY GRAIL.rar.
Go to the “File menu” of the Mt4 trading platform and click on “Open data folder”. Open the Mql4 folder and open the Indicators folder. Now paste the HOLY GRAIL.mq4 and HOLY GRAIL ex4 files into the Indicators folder and restart MetaTrader 4.