Pooja Parmar

Easily download any installed theme or plugin as a ZIP file directly from your WordPress admin dashboard. Adds a “Download” button to the Plugins and Themes screens for quick backups or migration. Now with bulk download support!
Features: 
* Download individual plugins and themes with a single click 
* Bulk download multiple plugins or themes at once 
* Organized ZIP structure for easy installation 
* Administrator-only access for security

Download Helper

Download Helper is a lightweight WordPress plugin that lets you manage and organize downloadable files directly from your dashboard.

sakisbal

This plugin is not of any use for general themes but is specifically created for 
my main theme perfectPortfolio.

perfectPortfolioHelper

The plugin is not for general use, but its a helper plugin for my main theme

Download Helper vs perfectPortfolioHelper