Once you have downloaded the file. Copy the file from your download location and paste into indicator directory on your MT4 Platform
Find your MT4 indicator directry:
On Your MT4 Platform goto File →Open Data folder → MQL4 → Indicator (paste the file here, e.g femcoco_indicator)
It is now available for selection in your list of indicators. Load the Indicator onto your chart and refresh
Click To Download Instructions for EA MT4
Click To Download Instructions for EA MT5