Templates remove everything from a chart and then add whatever is in your template. You shouldn't be trying to call one.
You can't call outside EAs. You can only replace your existing EA with another.
Since you have an EA, why are you trying to do manual trading?
If you have the the EA code, look what indicators it uses and just have those on the chart(s).
Install a second terminal (in a different folder, start with /portable) Put your EA on the demo account, manually trade the other terminal.