I solved the problem, maybe not very elegant, but it works! For the first time, as I said, I downloaded special version of phpThumb for cakePHP.
Here is link: https://github.com/simkimsia/phpThumb-for-cakephp-2.0
After there was my problem with the path because my images was in folder: C:\wamp\www\cakephp\app\webroot\img\uploads\product\filename\image.png
So I had to find this part of code(begins on line 1078):
if ($this->useCake) {
if ($this->config_document_root != null) {
$AbsoluteFilename = $this->config_document_root.DIRECTORY_SEPARATOR.$filename;
} else {
$AbsoluteFilename = WWW_ROOT.DIRECTORY_SEPARATOR.$filename;
}
}
And edit a the path to fit into my folder:
$AbsoluteFilename = $this->config_document_root.DIRECTORY_SEPARATOR.'cakephp'.DIRECTORY_SEPARATOR.'app'.DIRECTORY_SEPARATOR.'webroot'.DIRECTORY_SEPARATOR.$filename;
$AbsoluteFilename = WWW_ROOT.DIRECTORY_SEPARATOR.'cakephp'.DIRECTORY_SEPARATOR.'app'.DIRECTORY_SEPARATOR.'webroot'.DIRECTORY_SEPARATOR.$filename;
and now its working perfectly...