闲的难受，在一个反版权网站当卫道士，黄赌毒在西方国家和你大陆完全不是一个路数。

You need to provide url that there's not everyone who can read those foreign words.

Judging solely from an EPUB file itself, it is difficult to tell whether it is an original EPUB or one converted from AZW3 or MOBI. File size alone cannot serve as a reliable differentiator.

You need to download all EPUB files and open them in Sigil to examine their internal file‑structure ...

You need make sure you are in correct website, due to Chinese against rules, you must use VPN such as Clash, Shadowsocks etc. At last, check your internet connection if you can use google , if yes, try to login x, find the z-lib officical account and use this alternative websites if you can choose.