Problem with Upgrading from 1.3.1.1 to 1.4.3.0

[Nite]

I wanted to upgrade my prestashop to 1.4.3.0 version, but after taking every step from upgrading guide (database export, whole shop, exchange some files) i opened install folder, and then i saw this

Warning: include_once(/home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/classes/ToolsInstall.php) [function.include-once]: failed to open stream: No such file or directory in /home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/index.php on line 58

Warning: include_once() [function.include]: Failed opening '/home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/classes/ToolsInstall.php' for inclusion (include_path='.:/usr/share/php5:/usr/share/php:/usr/share/php/smarty') in /home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/index.php on line 58

Warning: include_once(/home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/classes/GetVersionFromDb.php) [function.include-once]: failed to open stream: No such file or directory in /home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/index.php on line 59

Warning: include_once() [function.include]: Failed opening '/home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/classes/GetVersionFromDb.php' for inclusion (include_path='.:/usr/share/php5:/usr/share/php:/usr/share/php/smarty') in /home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/index.php on line 59

Fatal error: Class 'ToolsInstall' not found in /home/vftp/checkpoint.lodz.pl-checkpoint/www/online/install/index.php on line 65

Something have gone wrong, it's very important thing for my to solve that, can you help me?