Method 1 – The StereoTrader way

Open a chart and click on the left box next to the StereoTrader clock to open StereoTrader settings menu.
At the drop down menu click on Installation Manager.
After the installation manager has opened click on next until you reach the Select your product page and select MT Tools Collection. Click next to install.
Go back to Metatrader and open the Navigator panel.
In the Navigator panel expand the Indicators folder, then StereoTrader and then TimoKosiol. Select the indicator and drag it onto the chart.

Method 2 – The manual way

After your download extract the zip file to a folder of your choice. Then open Metatrader and go to File->Open Data Folder.
On the new opened folder double click on MQL4 (or MQL5 when you are using Metatrader 5) and then Indicators and Stereotrader. Create a new folder called Metatrader-Tools.
Copy the extracted *.ex4 (or *.ex5 when you are using Metatrader 5) into the Metatrader-Tools folder.
Go back to Metatrader and open the Navigator panel.
In the Navigator panel expand the Indicators folder and then StereoTrader folder. Right click on StereoTrader and choose Refresh.
After the refresh the new created Metatrader-Tools folder will appear. 
Drag and drop the indicator onto your chart and choose your settings.