This may not be the best way to disable the Magento Extension as even after disable the extension maybe partially used. Still to use it, follow the below steps:

  • Login to your Store Admin panel using username/password.
  • From top menu, navigate to System > Configuration
  • Then on that page, click on the “Advanced” section within the “Advanced Tab” on the bottom left.
  • On that page, click the dropdown menu besides the Extension, choose "Disable", then click on “Save Config” button on the top right corner and you are done.

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NOTE: Your Extension name must be like this: “Excellence_Extensionname”