Install theme without using existing web address

Hey kasia80,
I would recommend a two stage approach, the first stage is to create a sub-domain on your webhost and install WordPress to be able to work on the new site. If you make your sub-domain “stagging” your url to work on the site would be “stagging.yourdomain.se” and it will not interfere with the main site. Here is a good step by step video: https://youtu.be/cJBKQvRvPeo
Now that you have your wordpress site running you can login and go to Dashboard > Appearance > Themes and click the “add new” button at the top of the screen. When asked for the file choose your enfold.zip inside the theme forest zip you downloaded. After you should also install the Enfold Child theme called enfold-child.zip Read about using a Child Theme and then active the child theme, it uses the Enfold theme, but allows you to save any special customizations after any theme updates.
Now you can start creating, here are some great videos to get you started: https://kriesi.at/documentation/enfold/videos/

When you are done, you can go to stage two, which will be to install WordPress on your main domain, much like before but you use your root folder when installing.
Then you can use the plugin called all-in-one-wp-migration to copy your stagging site to your main site, it’s very easy. Here’s a
All-in-One WP Migration tutorial
And that’s it. This may seem like a lot but it’s very easy, and if your have questions we will be happy to help.

Best regards,
Mike