Hi,
I decided to uninstall the plugin following the given steps to do so. I edited the .htaccess file to normal state, I deleted the define sentece in the wp-config.php, wp-content was writable, and in the plugin options I deleted all cached pages.
Then I Disabled the plugin.
The 2 php files created in wp-content were gone. WP-content has now the permition 755.
By FTP I can see this folders still exist:
wp-content/cache/supercache
Both are empty (cache and supercache).
But I can´t delete any of them:
550 Can't remove directory: Permission denied
: /public_html/wp-content/cache/supercache
Both have permissions 755, What is goin on?