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To create your site as per demo https://themagnifico.net/demo/cleaning-company/ please refer 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/smart-cleaning-company-pro-doc/
Please let us know if you need any other help.