This error occurs when you are trying to install a WordPress theme or plugin WordPress extracts your plugin or theme’s zip file into a folder named after the file itself. If a folder with the same name already exists, then WordPress cancels the installation with the following error message:

Destination folder already exists. /home/user/example.com/wp-content/plugins/wpforms/
Plugin install failed.

The first thing that you should do is visit your Themes or Plugins page to see if you have the plugin or theme already installed on your WordPress website.

If it isn’t already installed, then this could mean two things:

• A previous attempt to delete the plugin or theme didn’t succeed, and it left the plugin / theme folder behind.
• A previous installation attempt was interrupted and left an empty destination folder.

In either case, there will be a folder with the same name as the theme or plugin you are trying to install. This folder is stopping WordPress from completing the installation.

That being said, the ways to solve the ‘Destination folder already exists’ error in WordPress. You can either

1. Delete the Plugin/Theme folder and reinstall it
2. Replace the current folder with uploaded file