It is not physically possible to run a normal backtest as you would for a standalone EA as EuroHammer is utilisting four EAs trading together in parallel and interacting with one another.  Trade management is also across the trades on all three pairs as a single view.

What you will be able to do is run some back tests in visual mode to inspect the quality of trade entries, but it won’t be possible to get actual trade outcomes (profit / loss).  The forward test results are the best way to evaluate performance.
  Please refer to the live Forward Tests of EuroHammer which will provide you with a clear view of how it is trading in the live environment.

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FourLeafClover and EuroHammer Forex Trading Robots (Expert Advisors). Automated Profitable FX Trading Solution for MetaTrader