After installation I got folowing error:
Error – mPDF requires mb_string functions. Ensure that PHP is compiled with php_mbstring.dll enabled.

PDF Maker uses MPDF as PHP class to generate PDF files from HTML. MPDF requires the mb_string module to be enabled (see http://uk.php.net/manual/en/ref.mbstring.php) which means that PHP>=4.3.0 will be required as a minimum, and PHP 4.3.0 to 4.3.3 need –enable-mbstring=all. For Windows users: Enable the extension(s) in php.ini you want to use by uncommenting the extension=php_*.dll lines in php.ini. This is done by deleting the leading ; from the extension you want to load and restart Apache. http://php.net/manual/en/install.windows.extensions.php
// change the following line from …
;extension=php_mbstring.dll
// … to
extension=php_mbstring.dll