The error usually happens when the file you’re trying to upload is larger than the default upload and execution limits set by WordPress. The best way to fix the issue is to increase the default upload limits.

1. 1. Open .htaccess file in your WordPress directory. You may use any plain text editing software to open it.
      

      Missing .htaccess file?

      It is usually hidden by the OS, show hidden files and folder to reveal it.
      For mac users go to the WordPress installation folder and press Command +  shift +  . . For Windows users follow these Steps.

   2. Paste the following after “# BEGIN WordPress in .htaccess file”

      php_value upload_max_filesize 64M 
      php_value post_max_size 64M 
      php_value max_execution_time 300 
      php_value max_input_time 300

   3. Save the file and try reinstalling the plugin

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