If you have recently searched for documentation for Dynamics 365, you have probably discovered that the documentation is consolidating in https://docs.microsoft.com/en-us/dynamics365/.
So if you click “Enterprise Edition Applications,” you can find the user guide, customization guide, and administrator guide for Sales, Customer Service, Field Service, etc.
But what if you yearn for the old days and want to download a copy of the documentation? The good news is, you still can. From any page on docs.microsoft.com, look at the lower left side of the screen.
This will get you a PDF copy of the entire guide which you are viewing, just like old times.