Wordpress PCLZIP_ERR_MISSING_FILE (-4) : Missing archive file ‘/{plugin..}.tmp’ : error


How to fix PCLZIP_ERR_MISSING_FILE (-4) Missing file '/{somefile.tmp}' error when updating plugin in Wordpress 

 This solution is based on this WordPress.org thread.

 PROBLEM :
When you try to update WordPress or install plugins, the downloader / installer page pops up, the compressed file is downloaded to your server, but installation fails because of this error: PCLZIP_ERR_MISSING_FILE (-4) : Missing archive file ‘C:\Windows\TEMP/{whatever you were installing}.tmp’

SOLUTION :
You need to access the files on your server via FTP. If you haven’t done this before, there are tutorials out there.
Short version: find the FTP access details for your server, and grab FileZilla FTP Client. Or if your hosting provides a File Manager utility, use that.
On your server, navigate to the /wp-content folder.
Create a new folder inside it called TEMP.
Download /wp-config.php from your server to your computer.
Open it up in a text editor, and beneath
if ( !defined('ABSPATH') ) define('ABSPATH', dirname(__FILE__) . '/');
add the line
define('WP_TEMP_DIR', ABSPATH . 'wp-content/TEMP');
then save wp-config.php.
Upload it to your server again.
 Try updating WordPress or installing a plugin. It should work now.

The other solution is not to use Windows hosting!

For more details, see wordpress blog post

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