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. 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”