Electronics is the PT004 default theme. So if you want to use this theme you only need to add pt004. See image below.

When you want to use the electronics theme as your theme you can do this by setting the settings in System > Configuration > Design as shown in the image below. The rest of the settings are done as the main PT004 installation.

Schermafbeelding 2015-10-14 om 12.49.06