What do you mean by the links to the product that you have lost? The product can be accessed without any problems. I can also find it using the search function. Could you please describe your problem in more detail?
When you select from the drop down ie Blue 10M is shows “Sorry, no products matched your selection. Please choose a different combination.” I have checked the stock level colour and length and they all seem configured fine.
I recommend getting in touch with WooCommerce’s support about this via https://woocommerce.com/my-account/create-a-ticket/ if you have any of their paid WooCommerce products or https://projectdmc.org/support/plugin/woocommerce/ if you do not.
Thread continues at https://projectdmc.org/support/topic/missing-links-7/