Can’t install plugin via WP Toolkit: destination folder already exists

Symptoms

• Plugin for WordPress can not be installed with the following error in Plesk interface:

  An error occurred when installing the "wordpress-seo" plugin on the website with the ID 18: Could not install the wordpress-seo plugin on https://example.com website. Please check server logs or contact your server administrator.

• The following error can be found in %plesk_dir%adminlogsphp_error.log :

  Installing the plugin..
  Warning: Destination folder already exists. "C:/Inetpub/vhosts/example.com/wp-content/plugins/wordpress-seo/"
  Plugin installation failed.
  , stderr: No plugins installed.
  {"err_code":true,"err_message":"No plugins installed."}

Cause

Folder with name required for plugin installation already exists

Resolution

1. Login to Plesk

2. Go to Domains > example.com > File Manager

3. Find wp-content/plugins directory

4. Tick the plugin's directory (i.e. wordpress-seo)

5. Click the Remove button

   Note: Also, the directory might be renamed by clicking on the button and then Rename.

6. Install plugin once again