For experienced users
In some recent versions of WordPress there’s a conflict with the cache module – Xcache, which often results in the update failing because the module isn’t removed properly.
If you have problems updating or removing a plugin, you can solve it by adding the following line at the beginning of your .htaccess file (if you don’t have the file on your hosting, you can create it via FTP):
php_flag xcache.cacher Off
After that, the update should work without any problems. If not, feel free to contact us.