I think I finally got it, I did not upload all the files, see the installation package comes with 2 folders one general and another one for 1.37, I only upload the 1.37 one, on the general folder there is product.php and category.php that probably were causing all this, after I upload it I had to re-upload the .HTACCES file and reset the SEO from admin.


THANKS TO ALL OF YOU SPECIALLY ABSOLUTE