To convert an .mq4 indicator or expert advisor file to an .ex4 file and in turn, install the file so it shows up in the Navigator Window ,click on – File > Open Data Folder > MQL4 > Indicators (if it is an indicator file) or Experts if it is an expert advisor.
Restart your MT4 platform and you should now see your indicator or expert advisor show up in your navigator window. Just drag it into your chart window to install it.