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.
Step 5.1: Activate Theme
This is step is forpagayo_pt004_media-126.96.36.199.tgz and up only!!!
When you are installing this theme on a live shop, please go here for so tips.
Go to System > Configuration > Design > Themes. Add pt004 to Current Package Name. When you want to activate a sub theme, please go here.