[SOLVED]Error on update

-- url of the page with the problem -- : www.ilmondodiwit.com/shop/gioielli.html
-- HikaShop version -- : 2.3.3
-- Joomla version -- : 2.5.27
-- PHP version -- : 5.3.10
-- Browser(s) name and version -- : firefox
-- Error-message(debug-mod must be tuned on) -- : look below

I cannot update to the new version normally always worked. I get this error in debug mode:
Call stack
# Function Location
1 JAdministrator->dispatch() /path/to/my/webroot/administrator/index.php:46
2 JComponentHelper::renderComponent() /path/to/my/webroot/administrator/includes/application.php:153
3 JComponentHelper::executeComponent() /path/to/my/webroot/libraries/joomla/application/component/helper.php:348
4 require_once() /path/to/my/webroot/libraries/joomla/application/component/helper.php:380
5 JController->execute() /path/to/my/webroot/administrator/components/com_installer/installer.php:18
6 InstallerControllerInstall->install() /path/to/my/webroot/libraries/joomla/application/component/controller.php:761
7 InstallerModelInstall->install() /path/to/my/webroot/administrator/components/com_installer/controllers/install.php:29
8 JInstaller->install() /path/to/my/webroot/administrator/components/com_installer/models/install.php:105
9 JInstallerComponent->install() /path/to/my/webroot/libraries/joomla/installer/installer.php:472
10 JInstallerComponent->update() /path/to/my/webroot/libraries/joomla/installer/adapters/component.php:218
11 JInstaller->parseMedia() /path/to/my/webroot/libraries/joomla/installer/adapters/component.php:851
12 JInstaller->copyFiles() /path/to/my/webroot/libraries/joomla/installer/installer.php:1494
13 JFolder::copy() /path/to/my/webroot/libraries/joomla/installer/installer.php:1618
14 JFolder::copy() /path/to/my/webroot/libraries/joomla/filesystem/folder.php:124
15 JError::raiseError() /path/to/my/webroot/libraries/joomla/filesystem/folder.php:145
16 JError::raise() /path/to/my/webroot/libraries/joomla/error/error.php:251

Thanks for your reply

Hello,
can you install it via ftp as it's said on the documentation : www.hikashop.com/support/documentation/5...-to-install.html#ftp

Thanks for your reply.

I cannot find the lines in the folder.php I find only

// Translate path for the FTP account
                                                $dfid = JPath::clean(str_replace(JPATH_ROOT, $FTPOptions['root'], $dfid), '/');
                                                if (!$ftp->store($sfid, $dfid))
                                                {
                                                        return JError::raiseError(-1, JText::_('JLIB_FILESYSTEM_ERROR_COPY_FAILED'));
                                                }
                                                break;

Thanks for tour reply. I still could noto update until today. I didn't try FTP until now because of a time problem. Which permissions do i need to make it work?. 644 755 ?? Please give advice.
I also exceeded the number of download. Could you kindly tell me how to download the latest version.
Thanks for reply

Solved. It was a owner problemi of the files in the media folder. I didn't look the ownership only the permissione of the folder.
Thanks forma you replys