How to Install MT4 Expert Advisors — Step by Step

Installing MT4 expert advisors is straightforward once you know where everything goes. A complete guide from download to live chart.

Installing MT4 expert advisors takes less than five minutes once you know the process. The most common mistake is placing files in the wrong folder — this guide covers exactly where everything goes.

Before You Start

You need MT4 installed and connected to your broker. If you have not done this yet, download MT4 from your broker's website — most regulated brokers offer their own branded version which is identical to the standard platform.

Finding the MT4 Data Folder

Open MT4. In the top menu click File → Open Data Folder. This opens the MT4 data directory where all scripts, indicators and EAs are stored. Keep this folder open — you will need it.

Installing Expert Advisors (.ex4 files)

Navigate to MQL4 → Experts inside your data folder. Copy your .ex4 file into this folder. If you also have the .mq4 source file, place it in the same location.

Go back to MT4 and press F5 or right-click the Expert Advisors section in the Navigator panel and click Refresh. Your EA should now appear in the list.

Installing Indicators

The process is identical but the folder is different. Navigate to MQL4 → Indicators and paste your indicator files there. Refresh MT4 and they will appear under Custom Indicators in the Navigator.

Attaching to a Chart

Drag the EA or indicator from the Navigator panel onto any chart. A settings window will appear — configure your parameters and click OK. For EAs, make sure Auto Trading is enabled in the toolbar (the button should show a green play icon).

Common Issues

If your EA does not trade, check that Auto Trading is enabled and that the smiley face in the top right of the chart is showing. A sad face means the EA is not allowed to trade — usually because Auto Trading is disabled at the platform level.

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