Is there a way to have a sold out or discontinued digital product?

If you want the product link to remain but the product to be unavailable, you'll need to delete the digital version of the product and create a physical version in its place, using the same URL, with the stock set to zero. 

   If a post helps you, please click a "Like" option below  ↘️

That's what I thought.   Thank you for confirming that.