WordPress version: 3.4.2
WordPress SEO version: 220.127.116.11
I did this: Clicked update to WordPress SEO 18.104.22.168. via WordPress.
I expected the plugin to: update.
Instead it fails to install (message: Installation unsuccesful).
A following check with an ftp program reveals that the WordPress SEO folder is now empty except but for a CSS folder icon (also empty). All SEO work is gone.
I tried disabling all plugins before updating but it still fails.
What to do? Please? Really looking forward to resolve this.