This is a compiled file.
a. Go to File & click "Open Data Folder". Then navigate to MQL5 > Indicators. You need to put the .ex5 file into MT5’s MQL5 Indicators folder, then close & restart your MT5.
b. After that, you will see the EAs & Indicators on the left panel under Navigator. Then drag & drop it on the chart to attach the Indicator to a chart.