Which downloadable books are you trying to access? I’m not aware of any on this site and don’t recognise the image you’ve shared.
What types of recipe are you after? There are many relevant threads on here.
Editing to say I see from your other post that you’re interested in low carb.
Check out the dietdoctor.com website - full of recipes, information, meal plans etc. No need for any of their paid options, you can get what you need for free.