Start a new project.

Open ARES Electrical and click on the first button of quick access toolbar;
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Choose the drawing template you want to use (.dwt);
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Click to Open;
OK. A new ARES Electrical project will be opened.

Click on the ARES Electrical upper left icon in the menu;

Click in new...
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As the previous procedure, AE will display the Template dialog to be chosen;
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Select the drawing template you want to use (.dwt);

Click to Open.
The project will be opened with the chosen template.