Sounds like you are either out of disk space or permissions are not set correctly on the folders so that you are able to do the auto-update.
You can always try to FTP the updated plugin directory up to your server instead of doing the auto-update thru the WordPress admin.
Thread Starter
RLsARc
(@rlsarc)
got an unli disk space and set it 777 but fails to update.
This is a known issue which will be fixed in WordPress 4.4.1: https://core.trac.wordpress.org/ticket/34976
For now, you can “update” plugins and themes by deleting and installing the latest version.
Thread Starter
RLsARc
(@rlsarc)
Thansk! Worked for me!
For others who has the same issue:
Go to wp-admin/includes/class-wp-filesystem-ftpext.php
Find
$file_list = @ftp_nlist( $this->link, '-a ' . $path );
and change to
$file_list = @ftp_nlist( $this->link, $path );
