Hm thanks, haven’t thought of Calibre for years. All the free sites I’ve been to so far have links that flash when clicked on but there’s no evidence of a file anywhere (that I could find).
Usenet or bittorent have plenty if you can be bothered to learn to use them.
Calibre is great for book collections and then transferring them to whatever device in whatever format
I use Calibre to stick hooky books on my Kindle but I'm not sure if that's your question?