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To make your site as per demo https://www.themagnifico.net/eard/charity-wordpress-theme/ 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: https://www.themagnifico.net/eard/wathiqa/charity-pro-doc/
We hope this gives you the information you need.
Please let us know if you need anything further and we would be happy to help.