Follow these steps to install a Spice FSE Theme:

1. Log in to the WordPress Administration Panel. Now go to Appearance >> Themes

2. Here, you will see all the themes you have currently installed in your WordPress. Click on the Add New button.

3. After clicking on Add New button, type Spice FSE in the search box and you can see the WPKites theme. Click on the Install button and Activate it.