I accidentally deleted the theme on the dashboard

I’m about to build my own website, and therefore I installed enfold months ago on my server.

Since the Enfold didn’t appear on the Dashboard not as it is shown in tutorials I thought I might have done something wrong in the installation (regarding child theme etc.). So I deleted it on the dashboard under “Themes” since I thought the theme files are stored on my server, and it is just a matter of uploading the file on wp.

Unfortunately, on FTP, there are no Enfold files under /wp-content/themes.

What can I do here to re-access the theme that I bought in June 2018?

Thanks for your support.