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1 hour ago, ComGrafPL said:

Last step gets me error: Parse error: syntax error, unexpected '$product' (T_VARIABLE), expecting function (T_FUNCTION) or const (T_CONST)

On line:

$product = new Product((int)Tools::getValue('id_product'), false, $this->context->language->id);

But i haven't edit this line, so not sure.

I asked you if you have a default "classic" template. you said yes.
It's not true. You are using another template.
Do you use warehouse theme?

I installed the module and here is the result in the classic template.