

The "Export Themes" button next to "Add New Theme" on the Appearance → Themes screen.
ThemePackager adds a simple, native-feeling “Export Themes” button to the Appearance Themes screen, letting administrators download any installed theme as a ready-to-use ZIP archive without touching FTP, SSH, or a hosting file manager.
Key Features
all-themes.zip archive, with each theme in its own folder.ZipArchive class only — no external libraries, no Composer dependencies, no shell_exec()/exec()/system() calls.This plugin does not modify, move, or delete your theme files. It only reads them in order to build a ZIP archive for download.