This PrestaShop 1.5 module/override allows removal of number ID's from all URLs.

Install the module from the Backoffice (administration panel)

In the modules tab, click on add a new module. Click on Browse to open the dialogue box letting you search your computer, select the file then validate the dialogue box. Finally click on Upload this module.

Go to modules -> Find and uninstall "CleanURL".

Open folder /override/classes/ -> Remove "Link.php" -> Remove "Dispatcher.php"

Open folder /override/controllers/front/ -> Remove "CategoryController.php" -> Remove "CmsController.php" -> Remove "ManufacturerController.php" -> Remove "ProductController.php" -> Remove "SupplierController.php"

Open folder /cache/ -> Remove "class_index.php"

Go to back office -> Preferences -> SEO and URLs -> Set userfriendly URL off -> Save Go to back office -> Preferences -> SEO and URLs -> Set userfriendly URL on -> Save

If you got any other override modules, you should now go to you back office, uninstall them, and reinstall them again to work correctly.