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To make your site as per demo https://themagnifico.net/demo/online-tutor/ please refer below to the documentation for a better understanding.
Please take backup of your site if any data is available before activating our premium theme.
Here is the link of the documentation to install the theme: https://www.themagnifico.net/eard/wathiqa/online-tutor-pro-doc/
We hope this gives you the information you want.
Please let us know if you need anything further.