Installing an ex4 file is a simple and straightforward process in the MT4 Forex trading platform. To begin, first locate and download the ex4 file you need to install. Once the download has completed, launch the MT4 platform and open the ‘Navigator’ window. Then, look for the ‘Expert Advisors’ tab at the bottom of the list in the Navigator window and choose it. Now, drag and drop the downloaded ex4 file into the ‘Experts’ folder. Once the ex4 file has been successfully uploaded, it will appear in the ‘Experts’ folder in the Navigator window. Lastly, close the MT4 platform and relaunch it to complete the installation.