It is possible that at some point you may want to copy a theme from one WordPress site to another, either because you want to keep the configuration or because you want to use the same files.
In this guide, we will show the steps to copy a theme from one WordPress site to another from the WordPress administrator panel:
1. Download the theme: The first thing you need to do is download the theme you want to copy from the WordPress website or from the WordPress administration panel of the original site. To do this, log in to the WordPress administration panel of the original site, go to "Appearance" and then to "Themes". Select the theme you want to copy and access "Customize":

You will access the theme customization section. You must click the button in the top right corner and "Export" the theme as shown in the image. A ZIP file of the theme will be downloaded to your computer.

2. Upload the theme: Once you have downloaded the ZIP file of the theme, log in to the WordPress administration panel of the destination website where you want to copy the theme. Go to "Appearance" and then to "Themes". Click on "Add New" at the top of the screen:

Then click on "Upload Theme". Select the ZIP file of the theme you just downloaded and click "Install Now".

3. Activate the theme: Once you have uploaded the theme to your website, make sure to activate it. Go to "Appearance" and then to "Themes". Find the theme you just uploaded and click "Activate".

4. Configure the theme: Once you have activated the theme, you may need to configure it to suit your specific needs. Go to "Appearance" and then to "Customize". Here you can adjust the theme settings, such as the header image, colors, and widgets.

5. Import additional data (optional): If the theme you are copying includes additional data, such as demo content or predefined widgets, you will need to import them manually. In most cases, you can do this using the WordPress import/export plugin. Simply go to "Tools" and then to "Import", and select the XML file of the additional content you want to import.
With these steps, you should be able to copy a WordPress theme to another website without issues. However, keep in mind that some themes may require additional adjustments, and you may need to consult the theme documentation for more information on how to do so.