If you want to Donwload Book or any Artical first you signup your self if you alreday signup your account then login Zlibrary
After that you see 3 option on screeen you can selct Book Option to downoad book
You can see new option here you can put your book name or author name what you wnat to download
When you put the name of book or author then click on search
After that you get lots of the result to related your book then select one of the most review book
Then you land detailed discription and views of books and see download option
Click on download option and your book will download shortly.