Another way to add the Lunar Theme to your wordpress site is through FTP.
Here are some steps in using your FTP:
Download the Theme archive and extract the files it contains. You may need to preserve the directory structure in the archive when extracting these files.
Using an FTP client to access your host web server, create a directory name Composer and to save Composer Theme in the wp-content/themes directory provided by WordPress. For example, our Theme is named Composer so directory should be in wp-content/themes/Composer.
Upload the Theme files to the new directory on your host server.
From the Available Themes section, Select Composer theme and click on the activate.
Here is a video link for tutorial: